and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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Question 1
What is the primary function of the respiratory system?
A. Pump blood
B. Exchange oxygen and carbon dioxide
C. Produce hormones
D. Filter waste from blood
Correct Answer: B
Rationale:
The respiratory system’s main function is gas exchange—bringing oxygen into the
body and removing carbon dioxide.
Question 2
Which organ is primarily responsible for oxygenating blood?
A. Liver
B. Lungs
C. Kidneys
D. Pancreas
Correct Answer: B
Rationale:
The lungs perform gas exchange in the alveoli, oxygenating blood.
,Question 3
Normal adult respiratory rate is approximately:
A. 4–8 breaths/min
B. 8–10 breaths/min
C. 12–20 breaths/min
D. 30–40 breaths/min
Correct Answer: C
Rationale:
A normal adult respiratory rate is 12–20 breaths per minute.
Question 4
The main function of hemoglobin is to:
A. Fight infection
B. Carry oxygen
C. Produce insulin
D. Regulate temperature
Correct Answer: B
Rationale:
Hemoglobin transports oxygen from the lungs to tissues.
Question 5
Which vessel carries blood away from the heart?
A. Vein
B. Artery
C. Capillary
D. Venule
Correct Answer: B
,Rationale:
Arteries carry blood away from the heart.
Question 6
Which vessel carries blood back to the heart?
A. Artery
B. Vein
C. Aorta
D. Arteriole
Correct Answer: B
Rationale:
Veins return blood to the heart.
Question 7
What is the normal adult heart rate range?
A. 20–40 bpm
B. 40–60 bpm
C. 60–100 bpm
D. 120–160 bpm
Correct Answer: C
Rationale:
Normal resting adult heart rate is 60–100 beats per minute.
Question 8
The primary pacemaker of the heart is the:
A. AV node
B. SA node
, C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The SA node initiates electrical impulses controlling heart rhythm.
Question 9
Which system regulates body temperature?
A. Respiratory system
B. Nervous system
C. Integumentary system
D. Digestive system
Correct Answer: C
Rationale:
The skin and sweat glands regulate body temperature.
Question 10
Normal adult blood pressure is approximately:
A. 80/40 mmHg
B. 120/80 mmHg
C. 160/100 mmHg
D. 200/120 mmHg
Correct Answer: B
Rationale:
120/80 mmHg is considered average normal blood pressure.
Question 11