BIOS 242 Week 1 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the main function of the respiratory system?
A. Produce hormones
B. Gas exchange
C. Transport nutrients
D. Fight infection
Correct Answer: B
Rationale:The respiratory system delivers oxygen to tissues and
removes carbon dioxide.
2. Which structure is the main airway to the lungs?
A. Nose
B. Trachea
C. Larynx
D. Bronchi
Correct Answer: B
Rationale:The trachea conducts air from the larynx to the bronchi.
,3. Which lung has three lobes?
A. Left
B. Right
C. Both equal
D. None
Correct Answer: B
Rationale:The right lung has superior, middle, and inferior lobes.
4. Which structure prevents food from entering the airway?
A. Larynx
B. Epiglottis
C. Pharynx
D. Trachea
Correct Answer: B
Rationale:The epiglottis covers the glottis during swallowing.
5. What is tidal volume?
A. Maximum lung capacity
B. Air exchanged during normal breathing
C. Air left after exhalation
D. Air inhaled during deep breath
Correct Answer: B
Rationale:Tidal volume is the air moved during quiet, resting
breathing.
,6. Which cells produce surfactant in the alveoli?
A. Type I alveolar cells
B. Type II alveolar cells
C. Macrophages
D. RBCs
Correct Answer: B
Rationale:Surfactant reduces alveolar surface tension, preventing
collapse.
7. What is the main function of alveolar macrophages?
A. Gas exchange
B. Engulf pathogens
C. Produce surfactant
D. Carry oxygen
Correct Answer: B
Rationale:Macrophages phagocytize bacteria, dust, and debris in
alveoli.
8. Which gas law explains lung inflation and deflation?
A. Boyle’s law
B. Charles’ law
C. Dalton’s law
D. Henry’s law
Correct Answer: A
, Rationale:Boyle’s law describes inverse relationship between lung
volume and pressure.
9. What is the normal blood pH range?
A. 7.0–7.2
B. 7.35–7.45
C. 7.5–7.6
D. 6.8–7.0
Correct Answer: B
Rationale:Normal blood pH is tightly regulated to maintain enzyme
function and homeostasis.
10. Which structure divides the trachea into left and right
bronchi?
A. Larynx
B. Carina
C. Pharynx
D. Epiglottis
Correct Answer: B
Rationale:The carina is a cartilaginous ridge at the bifurcation of
the trachea.
11. Which structure is part of the upper respiratory tract?
A. Nose
B. Trachea
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the main function of the respiratory system?
A. Produce hormones
B. Gas exchange
C. Transport nutrients
D. Fight infection
Correct Answer: B
Rationale:The respiratory system delivers oxygen to tissues and
removes carbon dioxide.
2. Which structure is the main airway to the lungs?
A. Nose
B. Trachea
C. Larynx
D. Bronchi
Correct Answer: B
Rationale:The trachea conducts air from the larynx to the bronchi.
,3. Which lung has three lobes?
A. Left
B. Right
C. Both equal
D. None
Correct Answer: B
Rationale:The right lung has superior, middle, and inferior lobes.
4. Which structure prevents food from entering the airway?
A. Larynx
B. Epiglottis
C. Pharynx
D. Trachea
Correct Answer: B
Rationale:The epiglottis covers the glottis during swallowing.
5. What is tidal volume?
A. Maximum lung capacity
B. Air exchanged during normal breathing
C. Air left after exhalation
D. Air inhaled during deep breath
Correct Answer: B
Rationale:Tidal volume is the air moved during quiet, resting
breathing.
,6. Which cells produce surfactant in the alveoli?
A. Type I alveolar cells
B. Type II alveolar cells
C. Macrophages
D. RBCs
Correct Answer: B
Rationale:Surfactant reduces alveolar surface tension, preventing
collapse.
7. What is the main function of alveolar macrophages?
A. Gas exchange
B. Engulf pathogens
C. Produce surfactant
D. Carry oxygen
Correct Answer: B
Rationale:Macrophages phagocytize bacteria, dust, and debris in
alveoli.
8. Which gas law explains lung inflation and deflation?
A. Boyle’s law
B. Charles’ law
C. Dalton’s law
D. Henry’s law
Correct Answer: A
, Rationale:Boyle’s law describes inverse relationship between lung
volume and pressure.
9. What is the normal blood pH range?
A. 7.0–7.2
B. 7.35–7.45
C. 7.5–7.6
D. 6.8–7.0
Correct Answer: B
Rationale:Normal blood pH is tightly regulated to maintain enzyme
function and homeostasis.
10. Which structure divides the trachea into left and right
bronchi?
A. Larynx
B. Carina
C. Pharynx
D. Epiglottis
Correct Answer: B
Rationale:The carina is a cartilaginous ridge at the bifurcation of
the trachea.
11. Which structure is part of the upper respiratory tract?
A. Nose
B. Trachea
