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Choose the correct statement regarding inspiration and expiration :


( A ) all of the above
( B ) Expiration takes place when the intra-pulmonary pressure is higher than the atmospheric pressure.
( C ) Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure
( D ) Inspiration can occur if there is a negative pressure in the lungs with respect to atmospheric pressure.

1 Answer

(A) is the right answer.

Inspiration can occur 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. Similarly, expiration takes place when the intra-pulmonary pressure is higher than the atmospheric pressure. The diaphragm and a specialised set of muscles – external and internal intercostals between the ribs, help in generation of such gradients.
answered Apr 3, 2014 by pady_1
 

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