BIO 4: Anatomy & Physiology — 300 Questions & Answers
BIO 4: ANATOMY & PHYSIOLOGY EXAM COMPLETE QUESTIONS
AND 100% VERIFIED ANSWERS (PASS GUARANTEE) 2026/2027
1. What is the basic structural and functional unit of the human body?
Answer: The cell.
2. What are the four major tissue types in the human body?
Answer: Epithelial, connective, muscle, and nervous tissue.
3. What organelle is known as the 'powerhouse of the cell'?
Answer: The mitochondrion, which produces ATP via cellular respiration.
4. What is the function of the endoplasmic reticulum?
Answer: The rough ER synthesizes proteins; the smooth ER synthesizes
lipids and detoxifies chemicals.
5. What is the cell membrane composed of?
Answer: A phospholipid bilayer with embedded proteins, cholesterol, and
carbohydrates.
6. What is the difference between active and passive transport?
Answer: Passive transport requires no energy (e.g., diffusion, osmosis);
active transport requires ATP (e.g., sodium-potassium pump).
Page 1 of 32
,BIO 4: Anatomy & Physiology — 300 Questions & Answers
7. What is osmosis?
Answer: The movement of water across a semipermeable membrane from an
area of low solute concentration to high solute concentration.
8. What happens to a cell placed in a hypertonic solution?
Answer: The cell loses water by osmosis and shrinks (crenation in red blood
cells).
9. What is the role of the nucleus?
Answer: It contains DNA and controls cell activities including growth,
metabolism, and reproduction.
10. What are ribosomes?
Answer: Small organelles (free or attached to rough ER) that synthesize
proteins based on mRNA instructions.
11. What is the Golgi apparatus?
Answer: An organelle that modifies, packages, and ships proteins and lipids
to their final destinations.
12. What are lysosomes?
Answer: Membrane-bound organelles containing digestive enzymes that
break down waste materials and cellular debris.
13. What is the cytoskeleton?
Answer: A network of protein filaments (microfilaments, intermediate
filaments, microtubules) that gives the cell shape and supports movement.
14. What is epithelial tissue?
Answer: Tissue that lines body surfaces, cavities, and forms glands; it has
little extracellular matrix and is avascular.
15. What are the classifications of epithelial tissue based on cell layers?
Answer: Simple (one layer) and stratified (multiple layers).
16. What is simple squamous epithelium and where is it found?
Answer: A single layer of flat cells; found in alveoli of lungs, capillary walls,
and serous membranes.
17. What is pseudostratified epithelium?
Answer: An epithelium that appears layered but has all cells touching the
basement membrane; often found lining the trachea with cilia and goblet cells.
18. What is the basement membrane?
Page 2 of 32
,BIO 4: Anatomy & Physiology — 300 Questions & Answers
Answer: A thin extracellular layer that anchors epithelial cells to underlying
connective tissue.
19. What are the three types of connective tissue fibers?
Answer: Collagen fibers (strength), elastic fibers (elasticity), and reticular
fibers (support).
20. What is the difference between dense regular and dense irregular
connective tissue?
Answer: Dense regular has parallel collagen fibers (tendons, ligaments);
dense irregular has randomly arranged fibers (skin dermis).
21. What is cartilage?
Answer: A flexible connective tissue with chondrocytes in lacunae; avascular
and relies on diffusion for nutrients.
22. What are the three types of cartilage?
Answer: Hyaline (most common; articular surfaces), fibrocartilage
(intervertebral discs), and elastic cartilage (ear, epiglottis).
23. What is osseous tissue?
Answer: Bone tissue; a hard connective tissue with osteocytes in lacunae,
collagen fibers, and calcium phosphate mineral deposits.
24. What are the three types of muscle tissue?
Answer: Skeletal (voluntary, striated), cardiac (involuntary, striated,
branched), and smooth (involuntary, non-striated).
25. What is nervous tissue composed of?
Answer: Neurons (nerve cells) and neuroglia (supporting cells).
26. What is apoptosis?
Answer: Programmed cell death — a normal process for eliminating
damaged or unneeded cells without causing inflammation.
27. What is mitosis?
Answer: Cell division producing two genetically identical daughter cells;
phases are prophase, metaphase, anaphase, and telophase.
28. What is the cell cycle?
Answer: The sequence of events in a cell's life: G1 (growth), S (DNA
synthesis), G2 (preparation), and M (mitosis/cytokinesis).
29. What is the function of cilia?
Page 3 of 32
, BIO 4: Anatomy & Physiology — 300 Questions & Answers
Answer: Hair-like projections that move substances along the cell surface
(e.g., mucus in the respiratory tract).
30. What is a stem cell?
Answer: An undifferentiated cell capable of self-renewal and differentiation
into specialized cell types.
Page 4 of 32
BIO 4: ANATOMY & PHYSIOLOGY EXAM COMPLETE QUESTIONS
AND 100% VERIFIED ANSWERS (PASS GUARANTEE) 2026/2027
1. What is the basic structural and functional unit of the human body?
Answer: The cell.
2. What are the four major tissue types in the human body?
Answer: Epithelial, connective, muscle, and nervous tissue.
3. What organelle is known as the 'powerhouse of the cell'?
Answer: The mitochondrion, which produces ATP via cellular respiration.
4. What is the function of the endoplasmic reticulum?
Answer: The rough ER synthesizes proteins; the smooth ER synthesizes
lipids and detoxifies chemicals.
5. What is the cell membrane composed of?
Answer: A phospholipid bilayer with embedded proteins, cholesterol, and
carbohydrates.
6. What is the difference between active and passive transport?
Answer: Passive transport requires no energy (e.g., diffusion, osmosis);
active transport requires ATP (e.g., sodium-potassium pump).
Page 1 of 32
,BIO 4: Anatomy & Physiology — 300 Questions & Answers
7. What is osmosis?
Answer: The movement of water across a semipermeable membrane from an
area of low solute concentration to high solute concentration.
8. What happens to a cell placed in a hypertonic solution?
Answer: The cell loses water by osmosis and shrinks (crenation in red blood
cells).
9. What is the role of the nucleus?
Answer: It contains DNA and controls cell activities including growth,
metabolism, and reproduction.
10. What are ribosomes?
Answer: Small organelles (free or attached to rough ER) that synthesize
proteins based on mRNA instructions.
11. What is the Golgi apparatus?
Answer: An organelle that modifies, packages, and ships proteins and lipids
to their final destinations.
12. What are lysosomes?
Answer: Membrane-bound organelles containing digestive enzymes that
break down waste materials and cellular debris.
13. What is the cytoskeleton?
Answer: A network of protein filaments (microfilaments, intermediate
filaments, microtubules) that gives the cell shape and supports movement.
14. What is epithelial tissue?
Answer: Tissue that lines body surfaces, cavities, and forms glands; it has
little extracellular matrix and is avascular.
15. What are the classifications of epithelial tissue based on cell layers?
Answer: Simple (one layer) and stratified (multiple layers).
16. What is simple squamous epithelium and where is it found?
Answer: A single layer of flat cells; found in alveoli of lungs, capillary walls,
and serous membranes.
17. What is pseudostratified epithelium?
Answer: An epithelium that appears layered but has all cells touching the
basement membrane; often found lining the trachea with cilia and goblet cells.
18. What is the basement membrane?
Page 2 of 32
,BIO 4: Anatomy & Physiology — 300 Questions & Answers
Answer: A thin extracellular layer that anchors epithelial cells to underlying
connective tissue.
19. What are the three types of connective tissue fibers?
Answer: Collagen fibers (strength), elastic fibers (elasticity), and reticular
fibers (support).
20. What is the difference between dense regular and dense irregular
connective tissue?
Answer: Dense regular has parallel collagen fibers (tendons, ligaments);
dense irregular has randomly arranged fibers (skin dermis).
21. What is cartilage?
Answer: A flexible connective tissue with chondrocytes in lacunae; avascular
and relies on diffusion for nutrients.
22. What are the three types of cartilage?
Answer: Hyaline (most common; articular surfaces), fibrocartilage
(intervertebral discs), and elastic cartilage (ear, epiglottis).
23. What is osseous tissue?
Answer: Bone tissue; a hard connective tissue with osteocytes in lacunae,
collagen fibers, and calcium phosphate mineral deposits.
24. What are the three types of muscle tissue?
Answer: Skeletal (voluntary, striated), cardiac (involuntary, striated,
branched), and smooth (involuntary, non-striated).
25. What is nervous tissue composed of?
Answer: Neurons (nerve cells) and neuroglia (supporting cells).
26. What is apoptosis?
Answer: Programmed cell death — a normal process for eliminating
damaged or unneeded cells without causing inflammation.
27. What is mitosis?
Answer: Cell division producing two genetically identical daughter cells;
phases are prophase, metaphase, anaphase, and telophase.
28. What is the cell cycle?
Answer: The sequence of events in a cell's life: G1 (growth), S (DNA
synthesis), G2 (preparation), and M (mitosis/cytokinesis).
29. What is the function of cilia?
Page 3 of 32
, BIO 4: Anatomy & Physiology — 300 Questions & Answers
Answer: Hair-like projections that move substances along the cell surface
(e.g., mucus in the respiratory tract).
30. What is a stem cell?
Answer: An undifferentiated cell capable of self-renewal and differentiation
into specialized cell types.
Page 4 of 32
