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Question

What happens during gaseous exchange in the lungs?


  1. Oxygen diffuses into the blood and carbon dioxide diffuses out of it.

  2. Carbon dioxide diffuses into blood and oxygen diffuses into blood.

  3. None of the above

  4. Oxygen only diffuses


Solution

The correct option is A

Oxygen diffuses into the blood and carbon dioxide diffuses out of it.


For a healthy functioning of the body, oxygen gas must be taken in and carbon dioxide gas, which is harmful if present in large amounts, must be sent out of the body. During gaseous exchange in alveoli, oxygen diffuses in the blood capillaries and carbon dioxide diffuses out into the alveolar space.
 

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