The respiratory surfaces exhibit following characteristic?
Correct answer: A. It must be permeable
- A. It must be permeable
- B. It must be thick for low diffusion
- C. It should be non-vascularized
- D. It should have low ventilation mechanism
Explanation
Respiratory surfaces, such as the alveoli in the lungs, must be permeable to allow the exchange of gases (oxygen and carbon dioxide) through diffusion. This permeability allows gases to pass through the respiratory surface and be exchanged with the surrounding environment.
This question appeared on the UHS MDCAT 2022 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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