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# Help Zone

### Student Question

Secondary IV â€¢ 2mo.

what is gas exchange and diffusion?

Science

## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof â€¢ 2mo.

Hello Calm Swan!

Welcome on the Help Zone!

Gas exchange occurs in the human body to release toxic gases, such as $$CO_2$$, and to bring in needed gases, such as $$O_2$$.Â

Gas exchange occurs on the principle of diffusion, as gas moves from a place of higher concentration to a place of lower concentration. For example, when we breathe, the air in our lungs has a higher concentration of oxygen than our blood. This forces oxygen to move from the lungs to the blood.Â