In the lungs of mammals, the adaptation(s) that prevent(s) the collapse of alveoli is/ areI. the presence of flexible bronchioles that lead to the alveoliII. the one cell thick walls of the alveoliIII. the secretion of surfactant by the epithelial cells of alveoli
Correct answer: B. III
- A. I
- B. III
- C. I and III
- D. II and III
Explanation
The correct answer is Option B: IIIThe secretion of surfactant by the epithelial cells of alveoli is the main adaptation that prevents the collapse of alveoli in the lungs of mammals. Surfactant reduces surface tension, allowing alveoli to remain open during exhalation. The other options are incorrect because they do not directly address the mechanism of preventing alveolar collapse.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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