Question

The exchange of gases in human beings takes place in

• A. in skin
• B. in mouth
• C. in nostrils
• D. in lungs

Answer 1

The correct option is D

in lungs

The correct option is D.

Explanation of the correct option :

1. Respiration involves the exchange of gases, i.e. breathing and oxidation of food to release energy which occurs in the alveoli of the lungs.
2. The oxygen taken in during breathing oxidizes the food to release energy. Carbon dioxide is released during this process and is given out.
3. The process of taking in oxygen (inhalation) and giving out carbon dioxide (exhalation) is called respiration.
4. It is the most vital process that never stops in organisms.

Final answer: The exchange of gases in human beings takes place in the lungs.