Question

explain process of inspiration and expiration in details

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Answer 1

Inspiration:

• External intercoastal muscles and diaphragm muscles contract.

• Contraction of these muscles result in increased volume of intra-thoracic cavity due to antero-posterior and supero-inferior expansion.

• So, the intra-thoracic pressure falls (similar to Boyle's Law) and becomes lesser than the atmospheric air pressure.

• This pressure difference allows air to flow from atmosphere to the lungs (from high pressure to low pressure).

• This is the mechanism of inspiration.

Expiration:

• The external intercoastal muscles and diaphragm relax.

• This results in decrease in intra-thoracic volume.

• In turn , the intra-thoracic pressure increases and becomes greater than the atmospheric air pressure.

• So , air moves from lung (high pressure) to outside (low pressure).

• Sometimes , forceful expiration is made by contraction of internal intercoastal muscles and abdominal muscle contraction.

• This is the mechanism of expiration.

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Answer 2

Answer:

During expiration, there is a decrease in the volume of the thoracic cavity due to diaphragm being dome-shaped and contraction of the intercostal muscles. This allows the lungs to push the air outside

Explanation:

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