NEET Biology: Breathing and Exchange of Gases — Practice Set 9 (10 MCQs)

NEET Biology: Breathing and Exchange of Gases — Practice Set 9

Q1. Which of the following statements about alveolar gas exchange is incorrect?

A. Oxygen diffuses from alveoli into pulmonary capillaries due to partial pressure differences.
B. Carbon dioxide diffuses from blood into alveolar air due to its high solubility.
C. The alveolar walls are composed of a thick layer of smooth muscle to regulate diffusion.
D. Gas exchange occurs across a thin respiratory membrane.

A. Intrapulmonary pressure is always higher than atmospheric pressure.
B. During expiration, the diaphragm relaxes and moves upward.
C. Air moves into the lungs when intrapulmonary pressure exceeds atmospheric pressure.
D. External intercostal muscles contract during expiration.

A. The trachea is supported by complete cartilaginous rings.
B. Bronchioles lack cartilaginous support and rely on smooth muscle for constriction and dilation.
C. The alveoli are lined with thick layers of connective tissue for protection.
D. Pleural membranes are absent in mammals.

Biology — Breathing and Exchange of Gases

Set 9 of 14

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Which of the following statements about alveolar gas exchange is incorrect?

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