Exhalation is an active mechanism involving the relaxation of the muscles of inhalation,such as the diaphragm and the intercostals,and the return of the ribs to their resting position.

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Exhalation, especially at rest, is primarily a passive process that occurs due to the elastic recoil of the lungs and the relaxation of the diaphragm and intercostal muscles, without requiring active muscle contraction.

Exhalation Is an Active Mechanism Involving the Relaxation of the Muscles