BIOS 242 Week 1 Quiz Exam 2 (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. Transport nutrients
B. Exchange gases
C. Regulate temperature
D. Produce hormones
Correct Answer: B
Rationale:Gas exchange (oxygen in, carbon dioxide out) is the main
role of the respiratory system.
2. Which structure prevents food from entering the trachea?
A. Larynx
B. Epiglottis
C. Pharynx
D. Bronchus
,Correct Answer: B
Rationale:The epiglottis closes over the trachea during swallowing
to prevent aspiration.
3. Where does gas exchange occur in the lungs?
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
Correct Answer: C
Rationale:Alveoli are tiny air sacs with thin walls that allow oxygen
and carbon dioxide exchange.
4. What is the normal pH range of blood?
A. 6.8–7.0
B. 7.35–7.45
C. 7.5–8.0
D. 6.0–6.5
Correct Answer: B
Rationale:Blood pH is tightly regulated to maintain proper cellular
function.
5. Which gas is transported mainly by hemoglobin?
A. Nitrogen
B. Carbon dioxide
,C. Oxygen
D. Hydrogen
Correct Answer: C
Rationale:Hemoglobin binds oxygen in red blood cells for transport.
6. Which muscle is primarily responsible for breathing?
A. Intercostal muscles
B. Diaphragm
C. Abdominal muscles
D. Pectoral muscles
Correct Answer: B
Rationale:The diaphragm contracts and flattens to allow inhalation.
7. What is tidal volume?
A. Maximum air inhaled
B. Air left after exhalation
C. Air exchanged during normal breathing
D. Forced exhalation volume
Correct Answer: C
Rationale:Tidal volume is the amount of air inhaled or exhaled
during normal breathing.
8. Which structure connects the throat to the lungs?
A. Bronchioles
B. Trachea
, C. Alveoli
D. Esophagus
Correct Answer: B
Rationale:The trachea (windpipe) carries air to the bronchi.
9. What is the function of surfactant in the lungs?
A. Increase pressure
B. Reduce friction
C. Prevent alveolar collapse
D. Increase mucus
Correct Answer: C
Rationale:Surfactant reduces surface tension in alveoli, preventing
collapse.
10. Which structure divides the trachea into two bronchi?
A. Carina
B. Larynx
C. Pharynx
D. Diaphragm
Correct Answer: A
Rationale:The carina is the point where the trachea splits into right
and left bronchi.
11. What type of epithelium lines most of the respiratory tract?
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. Transport nutrients
B. Exchange gases
C. Regulate temperature
D. Produce hormones
Correct Answer: B
Rationale:Gas exchange (oxygen in, carbon dioxide out) is the main
role of the respiratory system.
2. Which structure prevents food from entering the trachea?
A. Larynx
B. Epiglottis
C. Pharynx
D. Bronchus
,Correct Answer: B
Rationale:The epiglottis closes over the trachea during swallowing
to prevent aspiration.
3. Where does gas exchange occur in the lungs?
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
Correct Answer: C
Rationale:Alveoli are tiny air sacs with thin walls that allow oxygen
and carbon dioxide exchange.
4. What is the normal pH range of blood?
A. 6.8–7.0
B. 7.35–7.45
C. 7.5–8.0
D. 6.0–6.5
Correct Answer: B
Rationale:Blood pH is tightly regulated to maintain proper cellular
function.
5. Which gas is transported mainly by hemoglobin?
A. Nitrogen
B. Carbon dioxide
,C. Oxygen
D. Hydrogen
Correct Answer: C
Rationale:Hemoglobin binds oxygen in red blood cells for transport.
6. Which muscle is primarily responsible for breathing?
A. Intercostal muscles
B. Diaphragm
C. Abdominal muscles
D. Pectoral muscles
Correct Answer: B
Rationale:The diaphragm contracts and flattens to allow inhalation.
7. What is tidal volume?
A. Maximum air inhaled
B. Air left after exhalation
C. Air exchanged during normal breathing
D. Forced exhalation volume
Correct Answer: C
Rationale:Tidal volume is the amount of air inhaled or exhaled
during normal breathing.
8. Which structure connects the throat to the lungs?
A. Bronchioles
B. Trachea
, C. Alveoli
D. Esophagus
Correct Answer: B
Rationale:The trachea (windpipe) carries air to the bronchi.
9. What is the function of surfactant in the lungs?
A. Increase pressure
B. Reduce friction
C. Prevent alveolar collapse
D. Increase mucus
Correct Answer: C
Rationale:Surfactant reduces surface tension in alveoli, preventing
collapse.
10. Which structure divides the trachea into two bronchi?
A. Carina
B. Larynx
C. Pharynx
D. Diaphragm
Correct Answer: A
Rationale:The carina is the point where the trachea splits into right
and left bronchi.
11. What type of epithelium lines most of the respiratory tract?
