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Question

When we breathe in, we inhale many gases, including oxygen. What happens to the gases that the body can't use?


  1. They are exhaled.

  2. They are changed into oxygen by the lungs.

  3. They circulate through the body and are disposed of later.

  4. They are absorbed into the digestive system and used to create energy.


Solution

The correct option is A

They are exhaled.


Inhalation is the process of breathing in air. The only part of the air that our body can use is oxygen. As we inhale, we take in all the gases present in the air around us. As we exhale, we push out the gases that our body can’t use. Breathing is actually a rhythmic process of inhalation and exhalation in which air rich in oxygen is taken in and air rich in carbon dioxide is given out.

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