BIOS 252 Week 6 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. The primary site of gas exchange in the lungs is:
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
Correct Answer: C
Rationale: Alveoli provide a large surface area and thin barrier for
O₂ and CO₂ diffusion.
2. The driving force for gas exchange in the lungs is:
A. Blood pressure
B. Partial pressure gradients
C. RBC count
D. Hemoglobin content
Correct Answer: B
Rationale: Gases diffuse from areas of high to low partial pressures.
,3. Pulmonary surfactant is produced by:
A. Type I alveolar cells
B. Type II alveolar cells
C. Macrophages
D. Bronchiolar epithelium
Correct Answer: B
Rationale: Surfactant reduces surface tension, preventing alveolar
collapse.
4. The trachea is reinforced by:
A. Smooth muscle
B. Hyaline cartilage rings
C. Elastic fibers
D. Bone
Correct Answer: B
Rationale: Cartilage maintains airway patency.
5. The main inspiratory muscle is:
A. Diaphragm
B. External intercostals
C. Internal intercostals
D. Abdominals
Correct Answer: A
Rationale: Contraction enlarges thoracic cavity, allowing air inflow.
,6. External intercostals function to:
A. Assist inspiration by elevating ribs
B. Compress abdomen
C. Expel air forcefully
D. Produce surfactant
Correct Answer: A
Rationale: Increase thoracic volume during inhalation.
7. The Hering-Breuer reflex prevents:
A. Overinflation of the lungs
B. Hypoxia
C. Hypercapnia
D. Anemia
Correct Answer: A
Rationale: Stretch receptors inhibit inspiration when lungs are
overinflated.
8. Tidal volume is:
A. Air moved in or out during normal breathing
B. Maximum inhalation
C. Residual volume
D. Dead space
Correct Answer: A
Rationale: Represents normal resting breath volume.
, 9. Inspiratory reserve volume (IRV) is:
A. Air inhaled beyond tidal inspiration
B. Air exhaled normally
C. Residual air
D. Total lung capacity
Correct Answer: A
Rationale: Allows for increased ventilation during deep breaths.
10. Expiratory reserve volume (ERV) is:
A. Air exhaled beyond normal tidal exhalation
B. Tidal volume
C. Residual volume
D. Total lung capacity
Correct Answer: A
Rationale: Used during forced exhalation.
11. Residual volume is:
A. Air remaining after maximal exhalation
B. Tidal air
C. Inspiratory air
D. Dead space only
Correct Answer: A
Rationale: Prevents alveolar collapse and maintains continuous gas
exchange.
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. The primary site of gas exchange in the lungs is:
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
Correct Answer: C
Rationale: Alveoli provide a large surface area and thin barrier for
O₂ and CO₂ diffusion.
2. The driving force for gas exchange in the lungs is:
A. Blood pressure
B. Partial pressure gradients
C. RBC count
D. Hemoglobin content
Correct Answer: B
Rationale: Gases diffuse from areas of high to low partial pressures.
,3. Pulmonary surfactant is produced by:
A. Type I alveolar cells
B. Type II alveolar cells
C. Macrophages
D. Bronchiolar epithelium
Correct Answer: B
Rationale: Surfactant reduces surface tension, preventing alveolar
collapse.
4. The trachea is reinforced by:
A. Smooth muscle
B. Hyaline cartilage rings
C. Elastic fibers
D. Bone
Correct Answer: B
Rationale: Cartilage maintains airway patency.
5. The main inspiratory muscle is:
A. Diaphragm
B. External intercostals
C. Internal intercostals
D. Abdominals
Correct Answer: A
Rationale: Contraction enlarges thoracic cavity, allowing air inflow.
,6. External intercostals function to:
A. Assist inspiration by elevating ribs
B. Compress abdomen
C. Expel air forcefully
D. Produce surfactant
Correct Answer: A
Rationale: Increase thoracic volume during inhalation.
7. The Hering-Breuer reflex prevents:
A. Overinflation of the lungs
B. Hypoxia
C. Hypercapnia
D. Anemia
Correct Answer: A
Rationale: Stretch receptors inhibit inspiration when lungs are
overinflated.
8. Tidal volume is:
A. Air moved in or out during normal breathing
B. Maximum inhalation
C. Residual volume
D. Dead space
Correct Answer: A
Rationale: Represents normal resting breath volume.
, 9. Inspiratory reserve volume (IRV) is:
A. Air inhaled beyond tidal inspiration
B. Air exhaled normally
C. Residual air
D. Total lung capacity
Correct Answer: A
Rationale: Allows for increased ventilation during deep breaths.
10. Expiratory reserve volume (ERV) is:
A. Air exhaled beyond normal tidal exhalation
B. Tidal volume
C. Residual volume
D. Total lung capacity
Correct Answer: A
Rationale: Used during forced exhalation.
11. Residual volume is:
A. Air remaining after maximal exhalation
B. Tidal air
C. Inspiratory air
D. Dead space only
Correct Answer: A
Rationale: Prevents alveolar collapse and maintains continuous gas
exchange.
