Why inhalation is called active process and exhalation is called passi

1.	Why inhalation is called active process and exhalation is called passive process???
Answer» Inhalation\xa0is an\xa0active process\xa0because 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.\xa0Exhalation begins when inhalation ends.\xa0The process of\xa0inhalation\xa0occurs 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\xa0exhalation; it is considered a\xa0passive\xa0process.

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