Comprehensive Study Guide: Skeletal, Muscular, Nervous, and Endocrine Systems

Study Guide - Smart Notes

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Module 5: Skeletal System

Terminology

The skeletal system consists of bones, joints, and associated structures that provide support, protection, and movement for the body. Understanding key terms is essential for mastering this system.

Ball-and-socket joint: A synovial joint allowing movement in all directions (e.g., shoulder, hip).
Bursa: Fluid-filled sac reducing friction between tissues.
Calcitonin: Hormone that lowers blood calcium levels.
Carpal tunnel syndrome: Compression of the median nerve in the wrist, causing pain and numbness.
Cartilage: Flexible connective tissue found in joints, ear, nose.
Clavicles: Collar bones connecting sternum to scapula.
Compact bone: Dense bone tissue providing strength.
Diaphysis: Shaft of a long bone.
Epiphysis: End part of a long bone, often involved in joint formation.
Fontanels: Soft spots on infant skulls where bones have not yet fused.
Foramen magnum: Large opening at the base of the skull for the spinal cord.
Growth plate (epiphyseal plate): Area of growing tissue near the ends of long bones in children.
Ligaments: Connective tissue connecting bones to other bones.
Osteoblasts: Cells that build new bone tissue.
Osteoclasts: Cells that break down bone tissue.
Osteocytes: Mature bone cells maintaining bone tissue.
Periosteum: Membrane covering the outer surface of bones.
Red marrow: Tissue in bones producing blood cells.
Yellow marrow: Fatty tissue in the medullary cavity of long bones.

Concepts

Functions of the Skeletal System: Provides support, protection, movement, mineral storage, and blood cell production.
Structure of Bone: Bones have a dense outer layer (compact bone) and a spongy inner layer (spongy bone), with marrow cavities.
Bone as a Living Tissue: Bone is dynamic, constantly remodeled by osteoblasts and osteoclasts.
Names and Locations of Selected Bones: Examples include femur (thigh), humerus (upper arm), and vertebrae (spine).
How to Build Bone Tissue: Adequate calcium, vitamin D, and weight-bearing exercise stimulate bone formation.
Why Children Have More Bones Than Adults: Some bones fuse during growth, reducing the total number in adulthood.

Module 6: Muscular System

Terminology

The muscular system enables movement, posture, and heat production. Key terms describe muscle structure, function, and physiology.

Acetylcholine: Neurotransmitter that stimulates muscle contraction.
Actin filament: Thin protein filament involved in muscle contraction.
Anabolic steroids: Synthetic substances that promote muscle growth.
Antagonistic muscles: Muscle pairs that produce opposite movements (e.g., biceps and triceps).
ATP (adenosine triphosphate): Main energy source for muscle contraction.
Creatine phosphate: Molecule that stores energy for rapid ATP regeneration in muscles.
Deltoid: Shoulder muscle responsible for arm abduction.
Fast-twitch muscle: Muscle fibers that contract quickly, suited for short bursts of power.
Glycogen: Stored form of glucose in muscles.
Insertion: Muscle attachment site that moves during contraction.
Lactic acid: Byproduct of anaerobic metabolism in muscles.
Muscle fatigue: Decline in muscle ability to generate force.
Myosin: Thick protein filament involved in muscle contraction.
Neuromuscular junction: Synapse between a motor neuron and muscle fiber.
Origin: Muscle attachment site that remains stationary during contraction.
Oxygen debt: Extra oxygen required after exercise to restore metabolic conditions.
Sarcomere: Functional unit of muscle contraction.
Sarcolemma: Muscle cell membrane.
Sarcoplasmic reticulum: Organelle storing calcium in muscle cells.
Slow-twitch muscle: Muscle fibers that contract slowly, suited for endurance.
Synergistic muscles: Muscles that assist the prime mover.
Tendon: Connective tissue attaching muscle to bone.
Tropomyosin & Troponin: Regulatory proteins controlling muscle contraction.

Concepts

Function of Muscles: Movement, posture, and heat production.
Muscle Contraction at Cellular Level: Involves sliding of actin and myosin filaments powered by ATP.
Structure of Muscle: Composed of bundles of muscle fibers, each containing myofibrils and sarcomeres.
Types of Muscle and Their Characteristics: Skeletal (voluntary, striated), cardiac (involuntary, striated), smooth (involuntary, non-striated).
Effects of Resistance Exercise: Increases muscle size (hypertrophy) and strength.
Muscle Atrophy: Muscles shrink and weaken if not used over time.
Location and Names of Selected Muscles: Examples include deltoid (shoulder), gastrocnemius (calf), rectus abdominis (abdomen).

Module 7: Nervous System

Terminology

The nervous system coordinates body activities through electrical and chemical signals. Key terms describe its structure and function.

Acetylcholine: Neurotransmitter involved in muscle activation and other functions.
Action potential: Electrical impulse traveling along neurons.
Amygdala: Brain region involved in emotion.
Axon: Long projection transmitting nerve impulses away from the cell body.
Cerebellum: Brain region coordinating movement and balance.
Cerebral cortex: Outer layer of the cerebrum, responsible for higher brain functions.
CNS (Central Nervous System): Brain and spinal cord.
Dendrites: Branching extensions receiving signals from other neurons.
Dopamine: Neurotransmitter involved in reward and movement.
Glial cells: Support cells in the nervous system.
Hippocampus: Brain region involved in memory formation.
Hypothalamus: Brain region regulating homeostasis and endocrine functions.
Interneurons: Neurons connecting sensory and motor pathways.
Medulla oblongata: Brainstem region controlling vital functions (breathing, heart rate).
Motor neuron: Neuron transmitting impulses to muscles.
Myelin sheath: Insulating layer around axons, speeding up signal transmission.
Neuron: Nerve cell transmitting electrical signals.
Neurotransmitter: Chemical messenger between neurons.
Node of Ranvier: Gaps in myelin sheath facilitating rapid conduction.
Parasympathetic nervous system: Division of autonomic nervous system promoting rest and digestion.
Schwann cell: Glial cell forming myelin in the peripheral nervous system.
Synapse: Junction between two neurons.
Thalamus: Brain region relaying sensory information.

Concepts

Divisions of the Nervous System: CNS (brain and spinal cord) vs. PNS (all other nerves).
Subdivisions of the PNS: Somatic (voluntary control) and autonomic (involuntary control).
Brain Area Functions: Damage to specific areas (e.g., Broca's area, hippocampus) impairs related functions (speech, memory).
Causes of Headaches, Spinal Cord Injury, Stroke, or Coma: May result from trauma, vascular events, or disease.
Protection of the Nervous System: Skull, vertebrae, meninges, and cerebrospinal fluid.
Diseases Involving Myelin Sheath: Multiple sclerosis causes demyelination, leading to neurological deficits.
Insecticide Poisoning Symptoms: May include muscle twitching, weakness, and nervous system dysfunction due to neurotransmitter disruption.

Module 8: Endocrine System

Terminology

The endocrine system regulates body functions through hormones secreted by glands. Understanding hormone names, functions, and related diseases is crucial.

Acromegaly: Disorder caused by excess growth hormone in adults.
ACTH (Adrenocorticotropic hormone): Stimulates adrenal cortex to release cortisol.
Addison's disease: Adrenal insufficiency causing fatigue, weight loss, and low blood pressure.
Antagonistic hormones: Hormones with opposing effects (e.g., insulin and glucagon).
Anterior pituitary gland: Produces several key hormones (e.g., ACTH, growth hormone).
Calcitonin: Lowers blood calcium levels.
Cushing's syndrome: Excess cortisol production.
Diabetes mellitus: High blood sugar due to insulin deficiency or resistance.
Glucagon: Raises blood glucose levels.
Goiter: Enlarged thyroid gland, often due to iodine deficiency.
Growth hormone: Stimulates growth and cell reproduction.
Insulin: Lowers blood glucose levels.
Myxedema: Severe hypothyroidism in adults.
Oxytocin: Stimulates uterine contractions and milk ejection.
Parathyroid gland: Regulates calcium levels via parathyroid hormone (PTH).
Posterior pituitary gland: Releases oxytocin and antidiuretic hormone (ADH).
Thyroid gland: Produces thyroid hormones (T3, T4) regulating metabolism.
Water-soluble hormone: Hormones that dissolve in water and act on cell surface receptors (e.g., insulin).

Concepts

Endocrine Glands and Hormone Control: Each gland produces specific hormones controlling various body functions (e.g., pituitary, thyroid, adrenal glands).
ACTH Effects: Stimulates adrenal cortex to produce cortisol; excess or deficiency affects stress response.
Hormones Produced by Each Gland: For example, pancreas (insulin, glucagon), thyroid (T3, T4, calcitonin), adrenal glands (cortisol, aldosterone, adrenaline).
Functions of Hormones: Regulate metabolism, growth, stress response, reproduction, and homeostasis.
Signs and Symptoms of Diseases: Cushing's syndrome (weight gain, high blood pressure), Addison's disease (fatigue, low blood pressure), diabetes mellitus (high blood sugar, frequent urination).

Sample Table: Comparison of Hormones and Their Functions

Hormone	Gland	Main Function
Insulin	Pancreas	Lowers blood glucose
Glucagon	Pancreas	Raises blood glucose
Thyroxine (T4)	Thyroid	Increases metabolic rate
Growth hormone	Pituitary	Stimulates growth
ACTH	Pituitary	Stimulates adrenal cortex
Cortisol	Adrenal cortex	Regulates metabolism, stress response

Key Equations and Concepts

Calcium Homeostasis:
Muscle Contraction (Sliding Filament Theory):
Action Potential Propagation:

Additional info: These notes expand on the provided terminology and concepts, offering definitions, examples, and context for exam preparation in Anatomy & Physiology. For each module, students should be able to define terms, explain concepts, and apply knowledge to clinical scenarios.