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Process of inhalation

Explain, how are process of the inhalation and expiration is carried out?

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The diaphragm and the intercostal muscles contracts and relaxes as per the thorax volume, compartment where there are lungs. The change of volume of thorax forces inhalation or expiration.
When the thorax volume is increased an internal pressure less than the atmospheric pressure (external) is created and gases enters the lungs. When the thorax volume is lowered internal pressure increases above the external pressure and the air gets expelled from the lungs.

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