Anatomy & Physiology Study Guide: Skeletal and Muscular Systems

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

Q1. What are the general functions of the skeletal system?

Background

Topic: Skeletal System Functions

This question tests your understanding of the roles the skeletal system plays in the human body, including support, protection, movement, and more.

Key Terms:

Support
Protection
Movement
Mineral storage
Blood cell production
Fat storage

Step-by-Step Guidance

List the main functions of the skeletal system. Think about how bones contribute to the body's structure and overall health.
Consider how bones protect internal organs (for example, the skull protects the brain).
Reflect on how bones interact with muscles to produce movement.
Remember that bones are involved in storing minerals like calcium and phosphorus.
Recall the role of bone marrow in producing blood cells.

Try solving on your own before revealing the answer!

Final Answer:

The skeletal system provides support, protects internal organs, enables movement by serving as attachment points for muscles, stores minerals (such as calcium and phosphorus), produces blood cells in the bone marrow, and stores fat in yellow marrow.

Q2. How are bones classified (long, short, flat, irregular, sesamoid)?

Background

Topic: Bone Classification

This question tests your knowledge of the different types of bones based on their shapes and functions.

Key Terms:

Long bones
Short bones
Flat bones
Irregular bones
Sesamoid bones

Step-by-Step Guidance

Identify the characteristics of each bone type (shape, location, function).
Think of examples for each category (e.g., femur for long bone).
Consider how the structure relates to the function (e.g., flat bones protect organs).
Review the unique features of sesamoid bones and where they are found.

Try solving on your own before revealing the answer!

Final Answer:

Long bones are longer than they are wide (e.g., femur), short bones are roughly cube-shaped (e.g., carpals), flat bones are thin and often protect organs (e.g., skull), irregular bones have complex shapes (e.g., vertebrae), and sesamoid bones are embedded in tendons (e.g., patella).

Q3. What is the organization of long bones, including the microscopic anatomy of an osteon?

Background

Topic: Long Bone Structure & Osteon Anatomy

This question tests your understanding of the macroscopic and microscopic structure of long bones, especially the arrangement of compact bone tissue.

Key Terms:

Diaphysis
Epiphysis
Medullary cavity
Osteon (Haversian system)
Lamellae
Central canal
Lacunae
Canaliculi

Step-by-Step Guidance

Describe the main parts of a long bone (diaphysis, epiphysis, medullary cavity).
Explain the function and location of the periosteum and endosteum.
Discuss the microscopic structure of compact bone, focusing on the osteon.
Identify the components of an osteon: central canal, lamellae, lacunae, canaliculi.

Try solving on your own before revealing the answer!

Final Answer:

Long bones have a diaphysis (shaft), epiphyses (ends), and a medullary cavity. The osteon is the structural unit of compact bone, consisting of concentric lamellae around a central canal, with osteocytes in lacunae connected by canaliculi.

Q4. What is the difference between compact and spongy bone?

Background

Topic: Bone Tissue Types

This question tests your ability to distinguish between the two main types of bone tissue and their functions.

Key Terms:

Compact bone
Spongy bone (cancellous bone)
Osteon
Trabeculae

Step-by-Step Guidance

Define compact bone and describe its structure (osteons).
Define spongy bone and describe its structure (trabeculae).
Compare their locations in bones (e.g., compact bone forms the outer layer).
Discuss their functions (strength vs. lightness and shock absorption).

Try solving on your own before revealing the answer!

Final Answer:

Compact bone is dense and organized into osteons, providing strength and support. Spongy bone consists of a network of trabeculae, is lighter, and helps absorb shock; it is found mainly in the epiphyses of long bones and inside flat bones.

Q5. How is the periosteum attached to the diaphysis?

Background

Topic: Bone Coverings

This question tests your understanding of the periosteum and its attachment to bone.

Key Terms:

Periosteum
Diaphysis
Sharpey's fibers (perforating fibers)

Step-by-Step Guidance

Define the periosteum and its function.
Identify the diaphysis as the shaft of a long bone.
Explain the role of Sharpey's fibers in attaching the periosteum to the diaphysis.

Try solving on your own before revealing the answer!

Final Answer:

The periosteum is attached to the diaphysis by Sharpe's fibers (perforating fibers), which anchor the periosteum to the underlying bone tissue.

Q6. What is the epiphyseal plate?

Background

Topic: Bone Growth

This question tests your understanding of how bones grow in length during development.

Key Terms:

Epiphyseal plate (growth plate)
Cartilage
Epiphysis
Diaphysis

Step-by-Step Guidance

Define the epiphyseal plate and its location in long bones.
Explain its composition (hyaline cartilage).
Describe its role in bone growth during childhood and adolescence.

Try solving on your own before revealing the answer!

Final Answer:

The epiphyseal plate is a layer of hyaline cartilage found between the epiphysis and diaphysis of long bones; it allows for growth in length until it closes and becomes the epiphyseal line in adulthood.

Q7. What is articular cartilage?

Background

Topic: Joint Structure

This question tests your knowledge of the components of joints and their functions.

Key Terms:

Articular cartilage
Hyaline cartilage
Joint surfaces

Step-by-Step Guidance

Define articular cartilage and its location.
Explain its composition (hyaline cartilage).
Describe its function in joints.

Try solving on your own before revealing the answer!

Final Answer:

Articular cartilage is a layer of hyaline cartilage covering the ends of bones at synovial joints, reducing friction and absorbing shock during movement.

Q8. What is the difference between red and yellow marrow?

Background

Topic: Bone Marrow Types

This question tests your understanding of the functions and locations of different types of bone marrow.

Key Terms:

Red marrow
Yellow marrow
Hematopoiesis
Fat storage

Step-by-Step Guidance

Define red marrow and its function.
Define yellow marrow and its function.
Identify where each type is found in the body.

Try solving on your own before revealing the answer!

Final Answer:

Red marrow produces blood cells (hematopoiesis) and is found in flat bones and the ends of long bones; yellow marrow stores fat and is found in the medullary cavity of long bones.

Q9. What does diploë refer to?

Background

Topic: Bone Structure (Flat Bones)

This question tests your knowledge of the anatomy of flat bones, especially in the skull.

Key Terms:

Diploë
Flat bone
Spongy bone

Step-by-Step Guidance

Define diploë and its location in flat bones.
Explain its function in the skull.
Describe its relationship to compact bone layers.

Try solving on your own before revealing the answer!

Final Answer:

Diploë is the spongy bone layer found between two layers of compact bone in flat bones, such as those of the skull; it helps absorb shock and protect the brain.

Q10. What makes up most of bone tissue matrix?

Background

Topic: Bone Matrix Composition

This question tests your understanding of the chemical makeup of bone tissue.

Key Terms:

Bone matrix
Inorganic matrix
Hydroxyapatite

Step-by-Step Guidance

Identify the two main components of bone matrix: organic and inorganic.
Describe the inorganic matrix and its role in bone strength.
Recall the main mineral found in the inorganic matrix.

Try solving on your own before revealing the answer!

Final Answer:

Most of the bone tissue matrix is made up of inorganic minerals, primarily hydroxyapatite (calcium phosphate crystals), which provide strength and rigidity.

Q11. What makes up the organic matrix of bone?

Background

Topic: Bone Matrix Composition

This question tests your knowledge of the organic components of bone tissue and their functions.

Key Terms:

Organic matrix
Collagen fibers
Proteoglycans

Step-by-Step Guidance

Identify the main components of the organic matrix.
Explain the role of collagen fibers in bone flexibility.
Describe the function of proteoglycans and other proteins.

Try solving on your own before revealing the answer!

Final Answer:

The organic matrix of bone is mainly composed of collagen fibers and proteoglycans, which provide flexibility and resistance to tension.

Q12. What are the types of bone cells and their functions?

Background

Topic: Bone Cell Types

This question tests your knowledge of the different cells found in bone tissue and their roles in bone maintenance and remodeling.

Key Terms:

Osteoblasts
Osteocytes
Osteoclasts
Osteogenic cells

Step-by-Step Guidance

List the four main types of bone cells.
Describe the function of each cell type (formation, maintenance, resorption).
Explain how these cells interact during bone remodeling.

Try solving on your own before revealing the answer!

Final Answer:

Osteoblasts build bone, osteocytes maintain bone tissue, osteoclasts break down bone, and osteogenic cells are stem cells that produce new osteoblasts.

Q13. What is the difference between intramembranous and endochondral ossification?

Background

Topic: Bone Formation

This question tests your understanding of the two main processes by which bones develop.

Key Terms:

Intramembranous ossification
Endochondral ossification
Mesenchyme
Cartilage model

Step-by-Step Guidance

Define intramembranous ossification and where it occurs.
Define endochondral ossification and where it occurs.
Compare the starting materials for each process (mesenchyme vs. cartilage).

Try solving on your own before revealing the answer!

Final Answer:

Intramembranous ossification forms flat bones directly from mesenchyme, while endochondral ossification forms most bones by replacing a cartilage model with bone.

Q14. Where does each type of ossification occur?

Background

Topic: Bone Formation Locations

This question tests your knowledge of which bones are formed by each ossification process.

Key Terms:

Flat bones
Long bones
Intramembranous ossification
Endochondral ossification

Step-by-Step Guidance

Identify which bones are formed by intramembranous ossification.
Identify which bones are formed by endochondral ossification.
Recall examples of each type (e.g., skull vs. femur).

Try solving on your own before revealing the answer!

Final Answer:

Intramembranous ossification occurs in flat bones like the skull and clavicle; endochondral ossification occurs in most bones, including long bones like the femur and humerus.

Q15. Where are primary and secondary ossification centers found in endochondral ossification?

Background

Topic: Bone Development

This question tests your understanding of the locations and timing of ossification centers during bone formation.

Key Terms:

Primary ossification center
Secondary ossification center
Diaphysis
Epiphysis

Step-by-Step Guidance

Define primary and secondary ossification centers.
Identify their locations in a developing long bone.
Recall the sequence of bone development (diaphysis first, then epiphyses).

Try solving on your own before revealing the answer!

Final Answer:

The primary ossification center is found in the diaphysis (shaft) of long bones; secondary ossification centers are found in the epiphyses (ends) of long bones.

Q16. Where does hyaline cartilage remain after endochondral ossification?

Background

Topic: Bone Development

This question tests your knowledge of the fate of cartilage during bone formation.

Key Terms:

Hyaline cartilage
Epiphyseal plate
Articular cartilage

Step-by-Step Guidance

Recall the locations where hyaline cartilage persists after bone formation.
Identify the epiphyseal plate and articular cartilage as key sites.
Explain the function of remaining cartilage in these areas.

Try solving on your own before revealing the answer!

Final Answer:

After endochondral ossification, hyaline cartilage remains at the epiphyseal plate (for growth) and as articular cartilage on joint surfaces.

Q17. Does appositional growth stop in an individual's lifetime?

Background

Topic: Bone Growth

This question tests your understanding of how bones grow in width and whether this process continues throughout life.

Key Terms:

Appositional growth
Bone remodeling

Step-by-Step Guidance

Define appositional growth and its role in bone thickness.
Consider whether bone remodeling continues after maturity.
Think about how bones respond to stress and injury throughout life.

Try solving on your own before revealing the answer!

Final Answer:

Appositional growth (increase in bone width) does not stop; bone remodeling continues throughout life as bones adapt to stress and repair themselves.

Q18. What structure is responsible for growth in length of bones?

Background

Topic: Bone Growth

This question tests your knowledge of the anatomical structure that allows bones to grow longer during development.

Key Terms:

Epiphyseal plate
Hyaline cartilage

Step-by-Step Guidance

Recall the location and function of the epiphyseal plate.
Explain how cartilage cells divide and are replaced by bone tissue.
Describe the process of bone elongation during growth.

Try solving on your own before revealing the answer!

Final Answer:

The epiphyseal plate (growth plate) is responsible for growth in length of bones; it is made of hyaline cartilage and allows for elongation until it closes.

Q19. What happens in each zone of cartilage during bone growth?

Background

Topic: Bone Growth Zones

This question tests your understanding of the different zones in the epiphyseal plate and their roles in bone elongation.

Key Terms:

Zone of reserve cartilage
Zone of proliferation
Zone of hypertrophy
Zone of calcification
Zone of ossification

Step-by-Step Guidance

List the five zones of cartilage in the epiphyseal plate.
Describe the function of each zone (cell division, enlargement, calcification, bone formation).
Explain how these zones contribute to bone growth in length.

Try solving on your own before revealing the answer!

Final Answer:

The zones are: reserve cartilage (resting), proliferation (cell division), hypertrophy (cell enlargement), calcification (matrix hardens), and ossification (new bone forms). Each zone plays a role in elongating the bone.

Q20. Is growth possible after the epiphyseal plate has closed?

Background

Topic: Bone Growth

This question tests your understanding of bone growth after maturity.

Key Terms:

Epiphyseal plate closure
Appositional growth

Step-by-Step Guidance

Recall what happens when the epiphyseal plate closes (becomes epiphyseal line).
Consider whether bones can still grow in length or width after closure.
Think about bone remodeling and appositional growth.

Try solving on your own before revealing the answer!

Final Answer:

After the epiphyseal plate closes, bones cannot grow in length, but they can still grow in width (appositional growth) and remodel throughout life.

Q21. How does growth hormone impact the epiphyseal plate?

Background

Topic: Hormonal Regulation of Bone Growth

This question tests your understanding of how hormones affect bone growth, especially during childhood and adolescence.

Key Terms:

Growth hormone (GH)
Epiphyseal plate
Chondrocytes

Step-by-Step Guidance

Describe the effect of growth hormone on chondrocytes in the epiphyseal plate.
Explain how GH stimulates cell division and bone elongation.
Consider the consequences of GH deficiency or excess.

Try solving on your own before revealing the answer!

Final Answer:

Growth hormone stimulates chondrocyte division in the epiphyseal plate, promoting bone growth in length; deficiency leads to short stature, excess can cause gigantism.

Q22. Which factors influence bone deposition vs. resorption?

Background

Topic: Bone Remodeling

This question tests your understanding of the factors that regulate bone formation and breakdown.

Key Terms:

Bone deposition
Bone resorption
Osteoblasts
Osteoclasts
Hormones
Mechanical stress

Step-by-Step Guidance

List the factors that promote bone deposition (e.g., hormones, exercise).
List the factors that promote bone resorption (e.g., parathyroid hormone, inactivity).
Explain how osteoblasts and osteoclasts respond to these factors.

Try solving on your own before revealing the answer!

Final Answer:

Bone deposition is influenced by hormones (calcitonin, growth hormone), mechanical stress, and adequate nutrition; bone resorption is promoted by parathyroid hormone, inactivity, and certain diseases.

Q23. Which vitamins and ions are needed for bone growth and remodeling?

Background

Topic: Nutrition and Bone Health

This question tests your knowledge of the nutrients required for healthy bone formation and maintenance.

Key Terms:

Calcium
Phosphorus
Vitamin D
Vitamin C
Vitamin A

Step-by-Step Guidance

List the essential ions for bone health.
Identify the vitamins needed for bone growth and remodeling.
Explain the role of each nutrient in bone metabolism.

Try solving on your own before revealing the answer!

Final Answer:

Calcium and phosphorus are essential ions; vitamins D, C, and A are needed for bone growth and remodeling. Vitamin D helps absorb calcium, vitamin C is needed for collagen synthesis, and vitamin A regulates bone cell activity.

Q24. Which deficiency can cause rickets in children?

Background

Topic: Bone Disorders

This question tests your knowledge of nutritional deficiencies and their effects on bone development.

Key Terms:

Rickets
Vitamin D deficiency
Calcium

Step-by-Step Guidance

Define rickets and its symptoms.
Identify the nutrient deficiency responsible for rickets.
Explain how this deficiency affects bone mineralization.

Try solving on your own before revealing the answer!

Final Answer:

Vitamin D deficiency causes rickets in children, leading to poor bone mineralization and deformities.

Q25. Which hormones are responsible for maintaining blood calcium levels?

Background

Topic: Calcium Homeostasis

This question tests your understanding of hormonal regulation of blood calcium levels.

Key Terms:

Calcitonin
Parathyroid hormone (PTH)
Calcium homeostasis

Step-by-Step Guidance

Identify the hormones involved in calcium regulation.
Describe the effect of each hormone on blood calcium levels.
Explain how these hormones interact with bone tissue.

Try solving on your own before revealing the answer!

Final Answer:

Calcitonin lowers blood calcium levels by promoting bone deposition; parathyroid hormone increases blood calcium by stimulating bone resorption.

Q26. What are the steps of fracture repair?

Background

Topic: Bone Healing

This question tests your knowledge of the process by which bones heal after a fracture.

Key Terms:

Hematoma formation
Fibrocartilaginous callus
Bony callus
Bone remodeling

Step-by-Step Guidance

List the four main steps of fracture repair.
Describe what happens during each step (hematoma, callus formation, bone formation, remodeling).
Explain the role of bone cells in each stage.

Try solving on your own before revealing the answer!

Final Answer:

Fracture repair involves hematoma formation, fibrocartilaginous callus formation, bony callus formation, and bone remodeling.

Q27. What are the general functions of joints?

Background

Topic: Joint Functions

This question tests your understanding of the roles joints play in the skeletal system.

Key Terms:

Joint (articulation)
Movement
Stability

Step-by-Step Guidance

List the main functions of joints.
Explain how joints allow movement between bones.
Describe how joints provide stability and flexibility.

Try solving on your own before revealing the answer!

Final Answer:

Joints allow movement, provide stability, and connect bones within the skeletal system.

Q28. How are joints classified structurally and functionally?

Background

Topic: Joint Classification

This question tests your knowledge of the different ways joints are categorized.

Key Terms:

Structural classification
Functional classification
Fibrous, cartilaginous, synovial joints
Synarthrosis, amphiarthrosis, diarthrosis

Step-by-Step Guidance

Define structural classification (based on tissue type).
Define functional classification (based on movement).
List the main types in each classification.

Try solving on your own before revealing the answer!

Final Answer:

Structurally, joints are classified as fibrous, cartilaginous, or synovial; functionally, they are classified as synarthrosis (immovable), amphiarthrosis (slightly movable), or diarthrosis (freely movable).

Q29. What are the subclasses of each structural classification of joints and examples of each?

Background

Topic: Joint Subtypes

This question tests your knowledge of the specific types of joints within each structural category.

Key Terms:

Fibrous joints: sutures, syndesmoses, gomphoses
Cartilaginous joints: synchondroses, symphyses
Synovial joints: hinge, plane, condylar, etc.

Step-by-Step Guidance

List the subclasses for fibrous, cartilaginous, and synovial joints.
Provide examples for each subclass (e.g., suture in skull).
Explain the movement allowed by each type.

Try solving on your own before revealing the answer!

Final Answer:

Fibrous: sutures (skull), syndesmoses (radius/ulna), gomphoses (teeth); cartilaginous: synchondroses (epiphyseal plate), symphyses (pubic symphysis); synovial: hinge (elbow), plane (carpals), condylar (knuckles).

Q30. What are the components of synovial joints?

Background

Topic: Synovial Joint Anatomy

This question tests your knowledge of the structures that make up synovial joints.

Key Terms:

Articular cartilage
Joint (synovial) cavity
Synovial fluid
Joint capsule
Ligaments

Step-by-Step Guidance

List the main components of a synovial joint.
Describe the function of each component.
Explain how these components work together to allow movement.

Try solving on your own before revealing the answer!

Final Answer:

Synovial joints have articular cartilage, a joint cavity filled with synovial fluid, a joint capsule, and supporting ligaments.

Q31. What are the axes of motion in synovial joints and examples of each?

Background

Topic: Joint Movement

This question tests your understanding of the directions in which synovial joints can move.

Key Terms:

Uniaxial
Biaxial
Multiaxial
Examples: hinge, condylar, ball-and-socket

Step-by-Step Guidance

Define uniaxial, biaxial, and multiaxial movement.
Provide examples of joints for each axis type.
Explain the types of movement allowed by each joint.

Try solving on your own before revealing the answer!

Final Answer:

Uniaxial: hinge (elbow); biaxial: condylar (knuckle); multiaxial: ball-and-socket (shoulder, hip).

Q32. What are the subclasses of synovial joints, their types of movement, and examples?

Background

Topic: Synovial Joint Types

This question tests your knowledge of the different types of synovial joints and their movements.

Key Terms:

Hinge, plane, condylar, saddle, pivot, ball-and-socket
Movement types: flexion, extension, rotation, etc.

Step-by-Step Guidance

List the subclasses of synovial joints.
Describe the movement allowed by each type.
Provide examples for each subclass.

Try solving on your own before revealing the answer!

Final Answer:

Hinge (elbow, flexion/extension), plane (carpals, gliding), condylar (knuckles, flexion/extension, abduction/adduction), saddle (thumb, similar to condylar), pivot (atlas/axis, rotation), ball-and-socket (shoulder/hip, all movements).

Q33. What are angular and special movements, and examples of each?

Background

Topic: Joint Movements

This question tests your knowledge of the types of movements possible at joints.

Key Terms:

Angular movements: flexion, extension, abduction, adduction
Special movements: pronation, supination, inversion, eversion, etc.

Step-by-Step Guidance

Define angular movements and give examples.
Define special movements and give examples.
Explain the anatomical planes involved in each movement.

Try solving on your own before revealing the answer!

Final Answer:

Angular: flexion (bending elbow), extension (straightening elbow), abduction (raising arm sideways), adduction (lowering arm); special: pronation/supination (forearm), inversion/eversion (foot).

Q34. Which movements oppose each other (e.g., flexion/extension, abduction/adduction)?

Background

Topic: Opposing Movements

This question tests your understanding of pairs of movements that are anatomical opposites.

Key Terms:

Flexion/extension
Abduction/adduction
Pronation/supination
Inversion/eversion

Step-by-Step Guidance

List pairs of opposing movements.
Describe the direction of each movement.
Provide examples for each pair.

Try solving on your own before revealing the answer!

Final Answer:

Flexion opposes extension; abduction opposes adduction; pronation opposes supination; inversion opposes eversion.

Q35. Which two articulations make up the elbow joint?

Background

Topic: Joint Anatomy

This question tests your knowledge of the specific bones and articulations involved in the elbow joint.

Key Terms:

Humeroulnar joint
Humeroradial joint

Step-by-Step Guidance

Identify the bones involved in the elbow joint.
List the two main articulations.
Describe the movement allowed by each articulation.

Try solving on your own before revealing the answer!

Final Answer:

The elbow joint consists of the humeroulnar and humeroradial articulations.

Q36. What tissue type makes up the medial meniscus of the knee?

Background

Topic: Joint Structure

This question tests your knowledge of the tissue composition of joint structures.

Key Terms:

Medial meniscus
Fibrocartilage

Step-by-Step Guidance

Define the medial meniscus and its function in the knee.
Identify the tissue type that forms the meniscus.
Explain why this tissue is suited for its role.

Try solving on your own before revealing the answer!

Final Answer:

The medial meniscus of the knee is made of fibrocartilage, which provides cushioning and stability.

Q37. Which joint is associated with the rotator cuff?

Background

Topic: Joint Anatomy

This question tests your knowledge of the rotator cuff and its associated joint.

Key Terms:

Rotator cuff
Shoulder joint (glenohumeral joint)

Step-by-Step Guidance

Define the rotator cuff and its function.
Identify the joint associated with the rotator cuff.
List the muscles involved in the rotator cuff.

Try solving on your own before revealing the answer!

Final Answer:

The rotator cuff is associated with the shoulder joint (glenohumeral joint).

Q38. Which joint is the coxal joint?

Background

Topic: Joint Anatomy

This question tests your knowledge of the anatomical name for the hip joint.

Key Terms:

Coxal joint
Hip joint
Ball-and-socket joint

Step-by-Step Guidance

Define the coxal joint.
Identify the bones involved in the coxal joint.
Describe the type of movement allowed by this joint.

Try solving on your own before revealing the answer!

Final Answer:

The coxal joint is the hip joint, a ball-and-socket joint between the femur and pelvis.

Q39. What are the general functions of muscle tissue?

Background

Topic: Muscle Tissue Functions

This question tests your understanding of the roles muscle tissue plays in the body.

Key Terms:

Movement
Posture
Heat production
Stabilization

Step-by-Step Guidance

List the main functions of muscle tissue.
Explain how muscles produce movement.
Describe the role of muscles in maintaining posture and generating heat.

Try solving on your own before revealing the answer!

Final Answer:

Muscle tissue produces movement, maintains posture, generates heat, and stabilizes joints.

Q40. How do skeletal, cardiac, and smooth muscle compare and contrast?

Background

Topic: Muscle Types

This question tests your knowledge of the similarities and differences among the three types of muscle tissue.

Key Terms:

Skeletal muscle
Cardiac muscle
Smooth muscle
Striations
Voluntary/involuntary

Step-by-Step Guidance

List the characteristics of each muscle type (location, control, appearance).
Compare their functions and structure (striated vs. non-striated).
Describe how each muscle type contracts.

Try solving on your own before revealing the answer!

Final Answer:

Skeletal muscle is striated and voluntary, cardiac muscle is striated and involuntary, smooth muscle is non-striated and involuntary; all contract to produce movement, but differ in control and structure.

Q41. How are skeletal muscle and smooth muscle contractions similar?

Background

Topic: Muscle Contraction Mechanisms

This question tests your understanding of the similarities in contraction between skeletal and smooth muscle.

Key Terms:

Sliding filament mechanism
Actin and myosin

Step-by-Step Guidance

Recall the basic mechanism of muscle contraction (sliding filament).
Identify the proteins involved in both muscle types.
Explain how contraction is triggered in each muscle type.

Try solving on your own before revealing the answer!

Final Answer:

Both skeletal and smooth muscle contractions involve the sliding of actin and myosin filaments, though the regulation and speed differ.

Q42. Define distensibility and elasticity.

Background

Topic: Muscle Properties

This question tests your understanding of the physical properties of muscle tissue.

Key Terms:

Distensibility
Elasticity

Step-by-Step Guidance

Define distensibility and its importance in muscle function.
Define elasticity and its role in muscle recovery after stretching.
Compare these properties to other tissues.

Try solving on your own before revealing the answer!

Final Answer:

Distensibility is the ability of muscle to stretch without damage; elasticity is the ability to return to original shape after being stretched.

Q43. What is the microscopic anatomy of muscle tissue?

Background

Topic: Muscle Cell Structure

This question tests your knowledge of the cellular components of muscle tissue.

Key Terms:

Sarcolemma
Sarcoplasmic reticulum
T tubules
Triad
Sarcomere

Step-by-Step Guidance

List the main structures found in muscle cells.
Describe the function of each structure.
Explain how these structures contribute to muscle contraction.

Try solving on your own before revealing the answer!

Final Answer:

Muscle cells contain a sarcolemma (cell membrane), sarcoplasmic reticulum (stores calcium), T tubules (conduct impulses), triads (SR and T tubule), and sarcomeres (contractile units).

Q44. What is the sliding filament mechanism?

Background

Topic: Muscle Contraction

This question tests your understanding of how muscles contract at the molecular level.

Key Terms:

Actin
Myosin
Cross-bridge

Step-by-Step Guidance

Describe the interaction between actin and myosin filaments.
Explain how ATP is used in the contraction process.
Outline the steps of cross-bridge cycling.

Try solving on your own before revealing the answer!

Final Answer:

The sliding filament mechanism involves myosin heads binding to actin, pulling the filaments past each other, shortening the sarcomere and causing muscle contraction.

Q45. What is resting membrane potential?

Background

Topic: Muscle Cell Physiology

This question tests your understanding of the electrical properties of muscle cells.

Key Terms:

Resting membrane potential
Polarization
Na+/K+ pump

Step-by-Step Guidance

Define resting membrane potential and its typical value.
Explain how the Na+/K+ pump establishes this potential.
Describe the distribution of ions across the membrane.

Try solving on your own before revealing the answer!

Final Answer:

Resting membrane potential is the voltage difference across the cell membrane when the cell is at rest, usually around -70 mV, maintained by the Na+/K+ pump.

Q46. What does it mean when a membrane is polarized?

Background

Topic: Cell Membrane Physiology

This question tests your understanding of the electrical state of cell membranes.

Key Terms:

Polarization
Resting membrane potential

Step-by-Step Guidance

Define polarization in the context of cell membranes.
Explain the distribution of charges across the membrane.
Describe how this state is maintained.

Try solving on your own before revealing the answer!

Final Answer:

A polarized membrane has a difference in charge across it, with the inside more negative than the outside, creating resting membrane potential.

Q47. Which ions and how many of each are pumped with the Na+/K+ pump?

Background

Topic: Cell Physiology

This question tests your knowledge of the sodium-potassium pump and its role in maintaining membrane potential.

Key Terms:

Na+/K+ pump
Sodium (Na+)
Potassium (K+)

Step-by-Step Guidance

Recall the direction and number of ions moved by the pump.
Explain how this movement contributes to membrane potential.
Describe the energy requirement for this process.

Try solving on your own before revealing the answer!

Final Answer:

The Na+/K+ pump moves 3 sodium ions out and 2 potassium ions in for each ATP used, helping maintain resting membrane potential.

Q48. Which ions are involved in depolarization and repolarization?

Background

Topic: Action Potential

This question tests your understanding of the ions responsible for changes in membrane potential during muscle contraction.

Key Terms:

Depolarization
Repolarization
Sodium (Na+)
Potassium (K+)

Step-by-Step Guidance

Identify the ion responsible for depolarization.
Identify the ion responsible for repolarization.
Explain how the movement of these ions changes membrane potential.

Try solving on your own before revealing the answer!

Final Answer:

Depolarization is caused by sodium ions entering the cell; repolarization is caused by potassium ions leaving the cell.

Q49. What are the parts of a neuromuscular junction?

Background

Topic: Muscle Cell Communication

This question tests your knowledge of the structure and function of the neuromuscular junction.

Key Terms:

Motor neuron
Synaptic cleft
Motor end plate
Acetylcholine

Step-by-Step Guidance

List the main parts of the neuromuscular junction.
Describe the function of each part.
Explain how signals are transmitted across the junction.

Try solving on your own before revealing the answer!

Final Answer:

The neuromuscular junction consists of the motor neuron terminal, synaptic cleft, and motor end plate on the muscle fiber.

Q50. How is acetylcholine released from a nerve cell?

Background

Topic: Neurotransmitter Release

This question tests your understanding of the process by which acetylcholine is released at the neuromuscular junction.

Key Terms:

Acetylcholine (ACh)
Synaptic vesicles
Exocytosis

Step-by-Step Guidance

Describe the process of neurotransmitter release from synaptic vesicles.
Explain the role of calcium ions in triggering exocytosis.
Outline the steps leading to acetylcholine release.

Try solving on your own before revealing the answer!

Final Answer:

Acetylcholine is released from nerve cells by exocytosis when calcium ions enter the terminal, causing synaptic vesicles to fuse with the membrane.

Q51. What is excitation-contraction coupling?

Background

Topic: Muscle Contraction

This question tests your understanding of the link between electrical signals and muscle contraction.

Key Terms:

Excitation-contraction coupling
Action potential
Calcium release

Step-by-Step Guidance

Describe how an action potential triggers calcium release from the sarcoplasmic reticulum.
Explain how calcium enables cross-bridge formation.
Outline the steps from nerve signal to muscle contraction.

Try solving on your own before revealing the answer!

Final Answer:

Excitation-contraction coupling is the process by which an action potential leads to calcium release, enabling muscle contraction.

Q52. What ion is released with the depolarization of the T tubule?

Background

Topic: Muscle Contraction

This question tests your knowledge of the ions involved in muscle contraction.

Key Terms:

Calcium ions (Ca2+)
T tubule
Sarcoplasmic reticulum

Step-by-Step Guidance

Recall the role of T tubules in conducting action potentials.
Identify the ion released from the sarcoplasmic reticulum.
Explain how this ion triggers muscle contraction.

Try solving on your own before revealing the answer!

Final Answer:

Calcium ions (Ca2+) are released from the sarcoplasmic reticulum when the T tubule is depolarized.

Q53. What are the steps of cross bridge cycling?

Background

Topic: Muscle Contraction

This question tests your understanding of the molecular events during muscle contraction.

Key Terms:

Cross bridge formation
Power stroke
ATP binding
Detachment

Step-by-Step Guidance

List the steps: cross bridge formation, power stroke, detachment, reactivation.
Describe the role of ATP in each step.
Explain how these steps lead to muscle contraction.

Try solving on your own before revealing the answer!

Final Answer:

Cross bridge cycling involves myosin binding to actin, performing a power stroke, detaching when ATP binds, and reactivating for another cycle.

Q54. How do muscles relax?

Background

Topic: Muscle Relaxation

This question tests your understanding of the process by which muscles return to their resting state.

Key Terms:

Calcium reuptake
ATP
Cross bridge detachment

Step-by-Step Guidance

Describe how calcium is removed from the cytoplasm.
Explain the role of ATP in detaching myosin from actin.
Outline the steps leading to muscle relaxation.

Try solving on your own before revealing the answer!

Final Answer:

Muscles relax when calcium is pumped back into the sarcoplasmic reticulum and ATP causes myosin to detach from actin.

Q55. What is a motor unit?

Background

Topic: Muscle Control

This question tests your understanding of how muscles are controlled by nerves.

Key Terms:

Motor unit
Motor neuron
Muscle fibers

Step-by-Step Guidance

Define a motor unit.
Explain how motor units vary in size and function.
Describe the importance of motor units in muscle contraction.

Try solving on your own before revealing the answer!

Final Answer:

A motor unit consists of a motor neuron and all the muscle fibers it innervates; it is the basic unit of muscle control.

Q56. What is muscle tone?

Background

Topic: Muscle Properties

This question tests your understanding of the continuous, passive contraction of muscles.

Key Terms:

Muscle tone
Posture

Step-by-Step Guidance

Define muscle tone.
Explain its role in maintaining posture.
Describe how muscle tone is regulated.

Try solving on your own before revealing the answer!

Final Answer:

Muscle tone is the continuous, partial contraction of muscles that maintains posture and readiness for action.

Q57. What is motor unit recruitment?

Background

Topic: Muscle Contraction Control

This question tests your understanding of how the body increases muscle force.

Key Terms:

Motor unit recruitment
Muscle tension

Step-by-Step Guidance

Define motor unit recruitment.
Explain how recruitment increases muscle tension.
Describe the order in which motor units are recruited.

Try solving on your own before revealing the answer!

Final Answer:

Motor unit recruitment is the process of activating more motor units to increase muscle tension and force.

Q58. What effect does repeated stimulation have on muscle tension?

Background

Topic: Muscle Contraction

This question tests your understanding of how repeated nerve impulses affect muscle force.

Key Terms:

Summation
Tetanus
Muscle fatigue

Step-by-Step Guidance

Describe what happens when a muscle receives repeated stimuli.
Explain the concepts of summation and tetanus.
Discuss the potential for muscle fatigue.

Try solving on your own before revealing the answer!

Final Answer:

Repeated stimulation increases muscle tension through summation and can lead to tetanus; prolonged stimulation may cause fatigue.

Q59. What are the types of muscle contraction: isometric, isotonic (concentric & eccentric)?

Background

Topic: Muscle Contraction Types

This question tests your knowledge of the different ways muscles contract.

Key Terms:

Isometric contraction
Isotonic contraction
Concentric
Eccentric

Step-by-Step Guidance

Define isometric and isotonic contractions.
Explain the difference between concentric and eccentric isotonic contractions.
Provide examples of each type.

Try solving on your own before revealing the answer!

Final Answer:

Isometric: muscle contracts without changing length; isotonic: muscle changes length. Concentric: muscle shortens; eccentric: muscle lengthens.

Q60. What is the difference between atrophy and hypertrophy?

Background

Topic: Muscle Adaptation

This question tests your understanding of how muscles change in response to activity or inactivity.

Key Terms:

Atrophy
Hypertrophy

Step-by-Step Guidance

Define atrophy and its causes.
Define hypertrophy and its causes.
Explain how activity level affects muscle size.

Try solving on your own before revealing the answer!

Final Answer:

Atrophy is the decrease in muscle size due to inactivity; hypertrophy is the increase in muscle size due to exercise.

Q61. What is required for glycolytic (anaerobic) catabolism to proceed?

Background

Topic: Muscle Metabolism

This question tests your understanding of the requirements for anaerobic energy production in muscle.

Key Terms:

Glycolysis
Anaerobic catabolism
Glucose

Step-by-Step Guidance

Define glycolytic (anaerobic) catabolism.
Identify the substrate required for glycolysis.
Explain the conditions under which anaerobic catabolism occurs.

Try solving on your own before revealing the answer!

Final Answer:

Glycolytic (anaerobic) catabolism requires glucose and occurs when oxygen is limited.

Q62. What is the function of myoglobin?

Background

Topic: Muscle Metabolism

This question tests your knowledge of the role of myoglobin in muscle cells.

Key Terms:

Myoglobin
Oxygen storage

Step-by-Step Guidance

Define myoglobin and its structure.
Explain how myoglobin stores and releases oxygen.
Describe its importance during muscle activity.

Try solving on your own before revealing the answer!

Final Answer:

Myoglobin stores oxygen in muscle cells, providing a reserve for aerobic metabolism during activity.

Q63. What causes muscle fatigue?

Background

Topic: Muscle Physiology

This question tests your understanding of the factors that lead to decreased muscle performance.

Key Terms:

Muscle fatigue
ATP depletion
Lactic acid

Step-by-Step Guidance

List the main causes of muscle fatigue.
Explain how ATP depletion affects contraction.
Describe the role of lactic acid and other factors.

Try solving on your own before revealing the answer!

Final Answer:

Muscle fatigue is caused by ATP depletion, accumulation of lactic acid, and other metabolic changes.

Q64. What is tetanus?

Background

Topic: Muscle Contraction

This question tests your understanding of sustained muscle contraction.

Key Terms:

Tetanus
Summation

Step-by-Step Guidance

Define tetanus in the context of muscle physiology.
Explain how repeated stimulation leads to tetanus.
Describe the difference between incomplete and complete tetanus.

Try solving on your own before revealing the answer!

Final Answer:

Tetanus is a sustained muscle contraction caused by rapid, repeated stimulation; it can be incomplete (partial relaxation) or complete (no relaxation).

Q65. What is the refractory period?

Background

Topic: Muscle Cell Physiology

This question tests your understanding of the time during which a muscle cell cannot respond to another stimulus.

Key Terms:

Refractory period
Action potential

Step-by-Step Guidance

Define refractory period.
Explain why the cell cannot respond during this time.
Describe its importance in muscle function.

Try solving on your own before revealing the answer!

Final Answer:

The refractory period is the time after an action potential when a muscle cell cannot respond to another stimulus, ensuring proper contraction cycles.

Q66. What is excess postexercise oxygen consumption (or oxygen debt)?

Background

Topic: Muscle Metabolism

This question tests your understanding of the physiological changes after exercise.

Key Terms:

Excess postexercise oxygen consumption (EPOC)
Oxygen debt

Step-by-Step Guidance

Define EPOC and oxygen debt.
Explain why extra oxygen is needed after exercise.
Describe the processes that require oxygen post-exercise.

Try solving on your own before revealing the answer!

Final Answer:

EPOC (oxygen debt) is the extra oxygen needed after exercise to restore ATP, clear lactic acid, and replenish myoglobin.

Q67. Which muscle fiber type lacks speed and allows for prolonged activity (like standing)?

Background

Topic: Muscle Fiber Types

This question tests your knowledge of the characteristics of different muscle fibers.

Key Terms:

Slow-twitch fibers (Type I)
Fast-twitch fibers (Type II)

Step-by-Step Guidance

Identify the muscle fiber type suited for endurance.
Describe the characteristics of slow-twitch fibers.
Explain why these fibers are important for prolonged activity.

Try solving on your own before revealing the answer!

Final Answer:

Slow-twitch (Type I) muscle fibers lack speed but are fatigue-resistant, allowing for prolonged activity like standing.