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  4. For the occurrence of expiration, intrapulmonary pressure should be

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Q. For the occurrence of expiration, intrapulmonary pressure should be

Breathing and Exchange of Gases

Solution:

Pressure gradient between lungs and atmosphere is required for the movement of air into and out of lungs. Expiration occurs when intrapulmonary pressure is more than the atmosphere pressure , as the air moves from region of higher to region of lower pressure and thus air is expelled out.