Define breathing. Explain any three differences between inhalation and exhalation.

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Solution

Breathing is a physical process in which the air moves in and out of the lungs.

Breathing process involves inhalation and exhalation.

Inhalation Exhalation

Air is taken in. Air is expelled out

Volume of chest cavity increases. Volume of chest cavity decreases.

Diaphragm is pushed up (contracts). Diaphragm is pulled down (relaxes).

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Inhalation	Exhalation
Air is taken in.	Air is expelled out
Volume of chest cavity increases.	Volume of chest cavity decreases.
Diaphragm is pushed up (contracts).	Diaphragm is pulled down (relaxes).