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Breathing and Exchange of Gases (MCQs)
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Avg score: 36% • Most missed: “Air is breathed through”
Breathing and Exchange of Gases (MCQs)
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25 Questions

1. Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as
2. The largest quantity of air that can be expired after a maximal inspiratory effort is called
3. What is the vital capacity of our lungs?
4. When CO2 concentration in blood increases, breathing becomes
5. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct?
6. Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?
7. The volume of air breathed in and out during normal breathing is called
8. Although much CO2 is carried in blood, yet blood does not become acidic, because
9. Air is breathed through
10. The alveolar epithelium in the lung is
11. Smoking destroys the cilia in the respiratory passageways. This
12. What would happen if human blood becomes acidic (low pH)
13. In emphysema
14. In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by
15. The exchange of gases in the alveoli of the lungs takes place by
16. Emphysema developes mainly because of
17. People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metre have around 8 million. This is because at high altitude
18. The haemoglobin of a human foetus
19. During inspiration the diaphragm
20. The structure which does not contribute to the breathing movements in mammals is
21. Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of
22. A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O2
23. Skin is an accessory organ of respiration in
24. Carbon dioxide is transported from tissues to respiratory surface by only
25. Even when there is no air in it, human trachea does not collapse due to presence of

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