how is expiration carried out under normal physiological conditions

Dear student,
Refer below for above asked query:-
Generally Expiration is a passive process because it occurs due to the relaxation of the diaphragm which was contracted during inspiration and it is also due to elastic recoiling of the lungs.
Thus under normal physiological conditions expiration occurs due to relaxation of diaphragm and elastic recoil of lungs.

Hope this information will clear your doubts about topic.

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