BIOS 242 Week 1 Quiz Exam 3 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary site of oxygen and carbon dioxide
exchange?
A. Bronchi
B. Alveoli
C. Trachea
D. Larynx
Correct Answer: B
Rationale:Alveoli are thin-walled sacs where gas exchange occurs
with capillaries.
2. Which structure prevents aspiration of food into the airway?
A. Larynx
B. Epiglottis
C. Pharynx
D. Bronchus
,Correct Answer: B
Rationale:The epiglottis closes over the larynx during swallowing.
3. What is the function of type II alveolar cells?
A. Gas exchange
B. Produce surfactant
C. Fight infection
D. Carry oxygen
Correct Answer: B
Rationale:Surfactant reduces alveolar surface tension, preventing
collapse.
4. Which gas law explains lung inflation and deflation?
A. Charles’ law
B. Boyle’s law
C. Dalton’s law
D. Henry’s law
Correct Answer: B
Rationale:Boyle’s law states that pressure and volume are inversely
proportional.
5. What is tidal volume?
A. Air inhaled during deep breath
B. Air exchanged during normal breathing
C. Air left in lungs after exhalation
,D. Maximum lung volume
Correct Answer: B
Rationale:Tidal volume is the amount of air moved during quiet
breathing.
6. Which respiratory muscle contracts during inspiration?
A. Diaphragm
B. Abdominal muscles
C. Intercostals
D. Pectorals
Correct Answer: A
Rationale:The diaphragm contracts and moves downward to draw
air in.
7. What is residual volume?
A. Air exhaled during forced breath
B. Air remaining in lungs after maximal exhalation
C. Air inhaled during quiet breathing
D. Maximum lung capacity
Correct Answer: B
Rationale:Residual volume prevents lung collapse and maintains
alveolar inflation.
8. Which structure is part of the upper respiratory tract?
, A. Trachea
B. Bronchi
C. Nose
D. Alveoli
Correct Answer: C
Rationale:The nose, nasal cavity, and pharynx constitute the upper
respiratory tract.
9. What is the main role of hemoglobin?
A. Produce hormones
B. Carry oxygen
C. Fight infection
D. Produce mucus
Correct Answer: B
Rationale:Hemoglobin in red blood cells binds oxygen for transport
to tissues.
10. What is the normal blood pH range?
A. 7.35–7.45
B. 6.8–7.0
C. 7.5–8.0
D. 6.0–6.5
Correct Answer: A
Rationale:Blood pH is tightly regulated for enzymatic and cellular
function.
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary site of oxygen and carbon dioxide
exchange?
A. Bronchi
B. Alveoli
C. Trachea
D. Larynx
Correct Answer: B
Rationale:Alveoli are thin-walled sacs where gas exchange occurs
with capillaries.
2. Which structure prevents aspiration of food into the airway?
A. Larynx
B. Epiglottis
C. Pharynx
D. Bronchus
,Correct Answer: B
Rationale:The epiglottis closes over the larynx during swallowing.
3. What is the function of type II alveolar cells?
A. Gas exchange
B. Produce surfactant
C. Fight infection
D. Carry oxygen
Correct Answer: B
Rationale:Surfactant reduces alveolar surface tension, preventing
collapse.
4. Which gas law explains lung inflation and deflation?
A. Charles’ law
B. Boyle’s law
C. Dalton’s law
D. Henry’s law
Correct Answer: B
Rationale:Boyle’s law states that pressure and volume are inversely
proportional.
5. What is tidal volume?
A. Air inhaled during deep breath
B. Air exchanged during normal breathing
C. Air left in lungs after exhalation
,D. Maximum lung volume
Correct Answer: B
Rationale:Tidal volume is the amount of air moved during quiet
breathing.
6. Which respiratory muscle contracts during inspiration?
A. Diaphragm
B. Abdominal muscles
C. Intercostals
D. Pectorals
Correct Answer: A
Rationale:The diaphragm contracts and moves downward to draw
air in.
7. What is residual volume?
A. Air exhaled during forced breath
B. Air remaining in lungs after maximal exhalation
C. Air inhaled during quiet breathing
D. Maximum lung capacity
Correct Answer: B
Rationale:Residual volume prevents lung collapse and maintains
alveolar inflation.
8. Which structure is part of the upper respiratory tract?
, A. Trachea
B. Bronchi
C. Nose
D. Alveoli
Correct Answer: C
Rationale:The nose, nasal cavity, and pharynx constitute the upper
respiratory tract.
9. What is the main role of hemoglobin?
A. Produce hormones
B. Carry oxygen
C. Fight infection
D. Produce mucus
Correct Answer: B
Rationale:Hemoglobin in red blood cells binds oxygen for transport
to tissues.
10. What is the normal blood pH range?
A. 7.35–7.45
B. 6.8–7.0
C. 7.5–8.0
D. 6.0–6.5
Correct Answer: A
Rationale:Blood pH is tightly regulated for enzymatic and cellular
function.
