BIOS 242 Week 7 Quiz Exam 1 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary function of the respiratory system?
A. Pump blood
B. Gas exchange
C. Digest food
D. Filter waste
Correct Answer: B
Rationale: The respiratory system facilitates oxygen intake and
carbon dioxide removal.
2. Which structure is the main site of gas exchange in the lungs?
A. Trachea
B. Bronchi
C. Alveoli
D. Larynx
Correct Answer: C
,Rationale: Alveoli provide a large surface area for oxygen and
carbon dioxide exchange.
3. What muscle primarily drives inhalation?
A. Diaphragm
B. Intercostals
C. Abdominal
D. Pectorals
Correct Answer: A
Rationale: The diaphragm contracts to increase thoracic volume
and draw air in.
4. What happens to the diaphragm during exhalation?
A. Contracts downward
B. Relaxes upward
C. Contracts upward
D. Remains stationary
Correct Answer: B
Rationale: Relaxation decreases thoracic volume, pushing air out.
5. What is tidal volume?
A. Max lung capacity
B. Volume per breath at rest
C. Residual air
D. Total exhaled air
,Correct Answer: B
Rationale: Tidal volume is the normal air exchanged during quiet
breathing.
6. What is the function of surfactant in the lungs?
A. Fight infection
B. Reduce surface tension
C. Transport oxygen
D. Produce mucus
Correct Answer: B
Rationale: Surfactant prevents alveolar collapse by reducing
surface tension.
7. Which gas has the highest concentration in alveolar air?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Helium
Correct Answer: B
Rationale: Nitrogen is the most abundant gas in air and alveoli.
8. Which gas diffuses from blood into alveoli?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
, D. Helium
Correct Answer: B
Rationale: Carbon dioxide is removed from blood via diffusion.
9. What is the primary transporter of oxygen in blood?
A. Plasma
B. Hemoglobin
C. Albumin
D. Myoglobin
Correct Answer: B
Rationale: Hemoglobin in RBCs binds oxygen for transport.
10. What is hypoxia?
A. Low blood glucose
B. Low tissue oxygen
C. High CO₂
D. High blood pressure
Correct Answer: B
Rationale: Hypoxia occurs when tissues receive insufficient oxygen.
11. Which part of the brain controls the basic rhythm of
breathing?
A. Cerebellum
B. Medulla oblongata
C. Hippocampus
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary function of the respiratory system?
A. Pump blood
B. Gas exchange
C. Digest food
D. Filter waste
Correct Answer: B
Rationale: The respiratory system facilitates oxygen intake and
carbon dioxide removal.
2. Which structure is the main site of gas exchange in the lungs?
A. Trachea
B. Bronchi
C. Alveoli
D. Larynx
Correct Answer: C
,Rationale: Alveoli provide a large surface area for oxygen and
carbon dioxide exchange.
3. What muscle primarily drives inhalation?
A. Diaphragm
B. Intercostals
C. Abdominal
D. Pectorals
Correct Answer: A
Rationale: The diaphragm contracts to increase thoracic volume
and draw air in.
4. What happens to the diaphragm during exhalation?
A. Contracts downward
B. Relaxes upward
C. Contracts upward
D. Remains stationary
Correct Answer: B
Rationale: Relaxation decreases thoracic volume, pushing air out.
5. What is tidal volume?
A. Max lung capacity
B. Volume per breath at rest
C. Residual air
D. Total exhaled air
,Correct Answer: B
Rationale: Tidal volume is the normal air exchanged during quiet
breathing.
6. What is the function of surfactant in the lungs?
A. Fight infection
B. Reduce surface tension
C. Transport oxygen
D. Produce mucus
Correct Answer: B
Rationale: Surfactant prevents alveolar collapse by reducing
surface tension.
7. Which gas has the highest concentration in alveolar air?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Helium
Correct Answer: B
Rationale: Nitrogen is the most abundant gas in air and alveoli.
8. Which gas diffuses from blood into alveoli?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
, D. Helium
Correct Answer: B
Rationale: Carbon dioxide is removed from blood via diffusion.
9. What is the primary transporter of oxygen in blood?
A. Plasma
B. Hemoglobin
C. Albumin
D. Myoglobin
Correct Answer: B
Rationale: Hemoglobin in RBCs binds oxygen for transport.
10. What is hypoxia?
A. Low blood glucose
B. Low tissue oxygen
C. High CO₂
D. High blood pressure
Correct Answer: B
Rationale: Hypoxia occurs when tissues receive insufficient oxygen.
11. Which part of the brain controls the basic rhythm of
breathing?
A. Cerebellum
B. Medulla oblongata
C. Hippocampus
