Comprehensive Final Exam Study Guide: Anatomy & Physiology

Comprehensive Final Exam Study Guide: Anatomy & Physiology

1. The Cell Cycle

The cell cycle is the series of events that cells go through as they grow and divide. It consists of interphase (G1, S, G2 phases) and mitosis (prophase, metaphase, anaphase, telophase), followed by cytokinesis.

• G1 Phase: Cell growth and normal functions.

• S Phase: DNA replication.

• G2 Phase: Preparation for mitosis.

• Mitosis: Division of the nucleus into two genetically identical daughter nuclei.

• Cytokinesis: Division of the cytoplasm, resulting in two separate cells.

Example: Skin cells undergo the cell cycle to replace damaged tissue.

2. Organelles of the Cell and Their Functions

Cells contain specialized structures called organelles, each with unique functions essential for cell survival.

• Nucleus: Contains genetic material (DNA) and controls cell activities.

• Mitochondria: Site of ATP (energy) production.

• Endoplasmic Reticulum (ER): Rough ER synthesizes proteins; smooth ER synthesizes lipids.

• Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.

• Lysosomes: Contain digestive enzymes to break down waste.

Example: Muscle cells have many mitochondria to meet high energy demands.

3. Organ System Functions

The human body is organized into organ systems, each with specific functions. For example, the integumentary system protects the body, and the skeletal system provides support.

• Integumentary System: Protects against environmental hazards, regulates temperature.

• Skeletal System: Provides structure, protects organs, stores minerals.

• Muscular System: Produces movement, maintains posture.

Example: The skeletal system works with muscles to enable movement.

4. Homeostasis and Feedback Mechanisms

Homeostasis is the maintenance of a stable internal environment. Feedback mechanisms regulate physiological processes.

• Negative Feedback: Reduces the effect of a stimulus (e.g., body temperature regulation).

• Positive Feedback: Enhances the effect of a stimulus (e.g., blood clotting).

Example: Sweating to cool the body is a negative feedback response.

5. Levels of Organization

Biological organization progresses from cells to tissues, organs, organ systems, and the organism.

• Cell → Tissue → Organ → Organ System → Organism

Example: Muscle cells form muscle tissue, which makes up muscles (organs).

6. Transport Across Cell Membranes

Cells regulate the movement of substances across their membranes using various transport mechanisms.

• Diffusion: Movement from high to low concentration.

• Osmosis: Diffusion of water across a semipermeable membrane.

• Isotonic Solution: No net water movement.

• Hypotonic Solution: Water enters the cell; cell may swell.

• Hypertonic Solution: Water leaves the cell; cell may shrink.

Example: Red blood cells in a hypertonic solution lose water and shrink.

7. Anatomy of a Long Bone

Long bones have distinct structural features important for support and movement.

• Diaphysis: Shaft of the bone.

• Epiphysis: Ends of the bone.

• Medullary Cavity: Contains bone marrow.

• Periosteum: Outer covering of bone.

Example: The femur is a long bone with a central shaft and expanded ends.

8. Bone Cells and Bone Growth

Bone tissue contains several cell types involved in growth and remodeling.

• Osteoblasts: Build new bone matrix.

• Osteocytes: Mature bone cells maintaining bone tissue.

• Osteoclasts: Break down bone matrix.

Example: Osteoclast activity increases during bone remodeling after a fracture.

9. Types of Joints

Joints connect bones and allow for movement. They are classified by structure and function.

• Fibrous Joints: Immovable (e.g., sutures of the skull).

• Cartilaginous Joints: Slightly movable (e.g., intervertebral discs).

• Synovial Joints: Freely movable (e.g., knee, shoulder).

Example: The elbow is a hinge-type synovial joint.

10. Muscle Tissue Types

There are three types of muscle tissue, each with unique characteristics and functions.

• Skeletal Muscle: Voluntary, striated, attached to bones.

• Cardiac Muscle: Involuntary, striated, found in the heart.

• Smooth Muscle: Involuntary, non-striated, found in walls of organs.

Example: Cardiac muscle contracts to pump blood throughout the body.

11. Nervous System Organization

The nervous system is divided into central and peripheral components, each with specific roles.

• CNS (Central Nervous System): Brain and spinal cord; processes information.

• PNS (Peripheral Nervous System): Nerves outside the CNS; transmits signals.

• Autonomic Nervous System: Controls involuntary functions (sympathetic and parasympathetic divisions).

Example: The sympathetic division increases heart rate during stress.

12. Brain Structure and Function

The brain is organized into regions with specialized functions.

• Cerebrum: Higher brain functions (thinking, memory).

• Cerebellum: Coordination and balance.

• Brainstem: Controls vital functions (breathing, heart rate).

Example: The cerebellum helps maintain posture and balance.

13. Spinal Cord and Reflexes

The spinal cord transmits signals between the brain and body and mediates reflex actions.

• Reflex Arc: Pathway for reflexes, involving sensory neuron, interneuron, and motor neuron.

Example: The knee-jerk reflex is a simple spinal reflex.

14. Endocrine System and Hormones

The endocrine system uses hormones to regulate body functions.

• Pituitary Gland: Master gland controlling other endocrine glands.

• Thyroid Gland: Regulates metabolism.

• Adrenal Glands: Produce stress hormones (e.g., cortisol, adrenaline).

Example: Insulin from the pancreas regulates blood glucose levels.

15. Blood and Cardiovascular System

The cardiovascular system transports nutrients, gases, and wastes throughout the body.

• Heart: Pumps blood through the circulatory system.

• Blood Vessels: Arteries, veins, and capillaries transport blood.

• Blood: Contains red cells (oxygen transport), white cells (immunity), platelets (clotting), and plasma.

Example: Oxygenated blood is pumped from the left ventricle to the body.

16. Respiratory System

The respiratory system exchanges gases between the body and the environment.

• Major Structures: Nasal cavity, pharynx, larynx, trachea, bronchi, lungs.

• Gas Exchange: Occurs in alveoli of the lungs.

Example: Oxygen diffuses from alveoli into pulmonary capillaries.

17. Digestive System

The digestive system breaks down food into nutrients for absorption and eliminates waste.

• Major Organs: Mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas.

• Enzymes: Amylase (carbohydrates), protease (proteins), lipase (fats).

Example: The small intestine absorbs nutrients into the bloodstream.

18. Urinary System

The urinary system removes waste products from the blood and maintains fluid and electrolyte balance.

• Major Organs: Kidneys, ureters, bladder, urethra.

• Nephron: Functional unit of the kidney; filters blood to form urine.

Example: The kidneys regulate blood pressure by adjusting fluid volume.

19. Reproductive System

The reproductive system produces gametes and enables fertilization and development of offspring.

• Male Structures: Testes, vas deferens, prostate, penis.

• Female Structures: Ovaries, fallopian tubes, uterus, vagina.

Example: The ovaries release eggs during ovulation.

20. Special Senses

The special senses include vision, hearing, taste, smell, and equilibrium.

• Vision: Eye structures (retina, lens, cornea).

• Hearing: Ear structures (cochlea, semicircular canals).

• Taste: Taste buds on the tongue detect chemicals in food.

Example: The cochlea converts sound waves into nerve impulses.

21. Fluid, Electrolyte, and Acid-Base Balance

The body maintains homeostasis by regulating fluid volume, electrolyte concentrations, and pH.

• Electrolytes: Sodium, potassium, calcium, chloride, etc.

• Acid-Base Balance: Maintained by buffers, respiration, and kidney function.

Example: The kidneys excrete hydrogen ions to regulate blood pH.

22. DNA, RNA, and Protein Synthesis

Genetic information is stored in DNA, transcribed into RNA, and translated into proteins.

• DNA: Double helix structure; contains genetic code.

• RNA: Messenger RNA (mRNA) carries code from DNA to ribosomes.

• Protein Synthesis: Occurs in ribosomes; involves transcription and translation.

Example: Hemoglobin is synthesized according to instructions in the DNA.

23. Table: Epithelial Tissue Types

The following table summarizes the main types of epithelial tissue and their locations/functions:

Type	Location	Function
Simple Squamous	Alveoli, blood vessels	Diffusion, filtration
Simple Cuboidal	Kidney tubules, glands	Secretion, absorption
Simple Columnar	Digestive tract lining	Absorption, secretion
Stratified Squamous	Skin, mouth, esophagus	Protection
Pseudostratified Columnar	Respiratory tract	Secretion, movement of mucus

Additional info: Table entries inferred from standard histology knowledge.

24. Key Equations

• Osmosis: $J = -L_p (\Delta P - \sigma \Delta \pi)$

• Cardiac Output: $CO = HR \times SV$

• Ohm's Law for Circulation: $\Delta P = Q \times R$

Additional info: Equations provided for reference in physiology calculations.