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Inspiration occurs when there is a negat...

Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when

A

intrapulmonary pressure is less than the atmospheric pressure

B

Intrapulmonary pressure is greater than the atmospheric pressure

C

intrapulmonary pressure is equal to the atmospheric pressure

D

intrapleural pressure becomes more than the intra-alveolar pressure.

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The correct Answer is:
A
Because of the pressure gradient between the lungs and the atmosphere, the air moves into and out of the lungs. Inspiration occurs if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure i.e. there is a negative pressure in the lungs with respect to atmospheric pressure.
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Asertiion : Inspirations occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure. Reason : During inspiration, a decrease in pulmonary volume increases the intre-pulmonary pressure than atmospheric pressure which forces the air from outside to moe into the lungs.

What is atmospheric pressure?

The unit atmospheric pressure is:

Inspiration can occur , when -

Atmospheric pressure is measured by

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