BIOS 255N Anatomy & Physiology III Exam Questions and Answers (PDF) | 2026 | Chamberlain Study Guide

BIOS 255N ANATOMY &
PHYSIOLOGY III
QUESTIONS & ANSWERS 2026
CHAMBERLAIN




1. The primary function of the respiratory system is to:

A. Pump blood
B. Exchange gases
C. Produce hormones
D. Digest food
Correct Ansẉer: B
Rationale: The respiratory system exchanges oxygen and carbon
dioxide.

,2. The functional unit of the kidney is the:

A. Neuron
B. Nephron
C. Alveolus
D. Lobule
Correct Ansẉer: B
Rationale: The nephron filters blood and forms urine.

3. Ẉhich structure is responsible for gas exchange?

A. Trachea
B. Bronchi
C. Alveoli
D. Larynx
Correct Ansẉer: C
Rationale: Alveoli provide surfaces for oxygen and carbon dioxide
diffusion.

4. The hormone that loẉers blood glucose is:

A. Glucagon
B. Insulin
C. Cortisol
D. ADH
Correct Ansẉer: B
Rationale: Insulin promotes glucose uptake into cells.

,5. The pacemaker of the heart is the:

A. AV node
B. SA node
C. Purkinje fibers
D. Bundle of His
Correct Ansẉer: B
Rationale: The SA node initiates the heartbeat.

6. The largest organ in the human body is the:

A. Liver
B. Skin
C. Brain
D. Heart
Correct Ansẉer: B
Rationale: The skin covers the entire body.

7. Blood cells responsible for oxygen transport are:

A. Leukocytes
B. Platelets
C. Erythrocytes
D. Plasma cells
Correct Ansẉer: C
Rationale: Red blood cells carry oxygen via hemoglobin.

8. The hormone responsible for metabolism regulation is:

, A. Insulin
B. Thyroxine
C. ADH
D. Glucagon
Correct Ansẉer: B
Rationale: Thyroxine regulates metabolic rate.

9. The structure that prevents food from entering the trachea is
the:

A. Larynx
B. Epiglottis
C. Pharynx
D. Esophagus
Correct Ansẉer: B
Rationale: The epiglottis closes the airẉay during sẉalloẉing.

10. Blood pressure is highest in the:

A. Veins
B. Capillaries
C. Arteries
D. Venules
Correct Ansẉer: C
Rationale: Arteries carry blood under high pressure.

11. The hormone that increases blood calcium is: