Which of the following statements Is not correct about alveoli:
Correct answer: B. The wall of each alveolus is 0.1 cm thick
- A. Alveoli form the gas exchange surface
- B. The wall of each alveolus is 0.1 cm thick
- C. Alveoli has a dense network of capillaries
- D. Collagen and elastin present in alveoli allow it to expand and recoil easily during breathing
Explanation
Option B regarding alveoli is not correct.The walls of alveoli are extremely thin, only about 0.0002 cm thick. This allows for the rapid diffusion of gases between the alveoli and the blood capillaries that surround them.while all other statements regarding alveoli are correct.
This question appeared on the KMU MDCAT 2023 paper, which you can sit online with every answer explained.
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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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