Why inhalation is called active process …

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Why inhalation is called active process and exhalation is called passive process???

Posted by Riya Saini 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 5 months ago

Inhalation is an active process because it requires energy and work. Expiration is typically a passive process that happens from the relaxation of the diaphragm muscle (that contracted during inspiration). The primary reason that expiration is passive is due to the elastic recoil of the lungs. Exhalation begins when inhalation ends. The process of inhalation occurs due to an increase in the lung volume (diaphragm contraction and chest wall expansion) which results in a decrease in lung pressure in comparison to the atmosphere; thus, air rushes in the airway. There is no contraction of muscles during exhalation; it is considered a passive process.

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