Everyday Science · Body Systems (Human Biology) · page 7 of 12

Respiratory System MCQs with Answers

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Respiratory System MCQs (61–70)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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61.
Respiratory center is situated in?
Correct Answer: B. Medulla Oblongata
One-liner
The respiratory center is situated in the Medulla Oblongata.
62.
The system that provides oxygen to the blood and removes carbon dioxide is _?
Correct Answer: C. Respiratory system
One-liner
The system that provides oxygen to the blood and removes carbon dioxide is the Respiratory system.
63.
How many lobes does the left lung have?
Correct Answer: B. Two
One-liner
The left lung has two lobes (superior and inferior), while the right lung has three lobes.
64.
Mechanical Ventilation is administered at which time?
Correct Answer: C. Respiratory failure
One-liner
Mechanical ventilation is administered when a patient experiences respiratory failure, meaning the lungs cannot adequately perform gas exchange on their own.
65.
The biological functions which perform gaseous exchange?
Correct Answer: C. Both a and b
One-liner
The biological functions that perform gaseous exchange are both breathing and respiration.
66.
The primary function of larynx is?
Correct Answer: D. Voice production
One-liner
The primary function of the larynx is voice production, which is why it is commonly called the voice box.
67.
Exchange of gases for the purpose of producing energy is called ?
Correct Answer: B. Breathing
One-liner
The exchange of gases for the purpose of producing energy is called breathing.
68.
If CO2 concentration in the blood increases, the breathing will _?
Correct Answer: D. Increase
One-liner
If CO2 concentration in the blood increases, the breathing will increase.
69.
Increase in rate of breathing is due to the following?
Correct Answer: A. Increase in CO2 in blood
One-liner
The increase in breathing rate is primarily due to increase in CO2 in blood, which stimulates the respiratory center in the brain.
70.
When you hold your breath, which of the following blood gas changes first leads to the urge to breathe?
Correct Answer: C. Rising CO₂ levels
One-liner
The urge to breathe when holding your breath is primarily triggered by rising CO₂ levels in the blood, not by falling oxygen levels.

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Respiratory System MCQs with Answers

Respiratory System MCQs (61–70)

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