Title: Comprehensive Anatomy & Physiology Revision Tests (Chapters 1-22)

Below is a set of 42revision test questions—one per chapter (Ch. 1–22)—designed to help
review key concepts from Anatomy and Physiology 8th Edition by Valerie C. Scanlon and Tina
Sanders. Each question is multiple choice and is followed by a brief rationale explaining the
answer. You can use these to test your understanding and reinforce your study.


Chapter 1: Introduction to Anatomy and Physiology

Question 1: Which term best describes the body’s ability to maintain a stable internal environment
despite external changes?

 A. Adaptation

 B. Homeostasis

 C. Equilibrium

 D. Regulation

Correct Answer: B. Homeostasis
Rationale: Homeostasis refers to the dynamic processes that maintain the constancy of the internal
environment—an essential concept introduced in Chapter 1.



Chapter 2: The Chemical Level of Organization

Question 2: Which element is most abundant in the human body by mass?

 A. Carbon

 B. Oxygen

 C. Hydrogen

 D. Nitrogen

Correct Answer: B. Oxygen
Rationale: Oxygen is the most abundant element in the human body by mass, largely because of its
presence in water and organic compounds, a key concept when discussing the chemical basis of life.



Chapter 3: The Cellular Level of Organization

Question 3: What is the primary function of mitochondria?

 A. Protein synthesis

 B. Energy (ATP) production

 C. Lipid metabolism

,  D. Detoxification

Correct Answer: B. Energy (ATP) production
Rationale: Mitochondria are known as the “powerhouses” of the cell because they generate most of the
cell’s ATP through aerobic respiration—a fundamental cellular function.



Chapter 4: The Tissue Level of Organization

Question 4: Which type of tissue primarily functions in covering and protecting body surfaces?

 A. Connective tissue

 B. Epithelial tissue

 C. Muscle tissue

 D. Nervous tissue

Correct Answer: B. Epithelial tissue
Rationale: Epithelial tissue forms continuous sheets that cover body surfaces and line body cavities,
serving protective, absorptive, and secretory functions.



Chapter 5: The Integumentary System

Question 5: In which layer of the skin are melanocytes primarily found?

 A. Epidermis

 B. Dermis

 C. Hypodermis

 D. Subcutaneous tissue

Correct Answer: A. Epidermis
Rationale: Melanocytes, which produce the pigment melanin, reside mainly in the basal layer of the
epidermis, contributing to skin color and UV protection.



Chapter 6: The Skeletal System

Question 6: What is the primary function of the axial skeleton?

 A. Supporting the limbs

 B. Facilitating movement

 C. Protecting the central nervous system and vital organs

 D. Producing blood cells

, Correct Answer: C. Protecting the central nervous system and vital organs
Rationale: The axial skeleton (which includes the skull, vertebral column, and rib cage) primarily serves
to protect critical structures such as the brain, spinal cord, heart, and lungs.



Chapter 7: The Muscular System

Question 7: Which type of muscle tissue is under voluntary control?

 A. Cardiac muscle

 B. Smooth muscle

 C. Skeletal muscle

 D. None of the above

Correct Answer: C. Skeletal muscle
Rationale: Skeletal muscle is striated and under voluntary control, enabling purposeful movements,
unlike cardiac or smooth muscle which are involuntary.



Chapter 8: The Nervous System

Question 8: What is the primary function of the myelin sheath?

 A. To protect the neuron’s cell body

 B. To speed up nerve impulse conduction

 C. To generate action potentials

 D. To store neurotransmitters

Correct Answer: B. To speed up nerve impulse conduction
Rationale: The myelin sheath is an insulating layer around axons that allows electrical impulses to travel
quickly and efficiently along the nerve cells.



Chapter 9: The Endocrine System

Question 9: Which gland is often referred to as the "master gland" of the endocrine system?

 A. Thyroid

 B. Adrenal

 C. Pituitary

 D. Pancreas