The alveoli represent total surface area of
Correct answer: C. 70-90m
- A. 10-30m
- B. 30-60m
- C. 70-90m
- D. 90-110m
Explanation
The alveoli form the gas exchange surface in the lungs, with about 700 million alveoli contributing to a total surface area of 70-90m2. Options A, B, and D provide ranges that are either too low or too high, making them incorrect.
This question appeared on the ETEA MDCAT 2019 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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