NEET BIOLOGY

Detailed explanation-1: -Expiration is the process by which foul air is expelled out of the lungs. Expiration is a normal passive process that involves the relaxation of inspiratory muscles.

Detailed explanation-2: -When breathing for life, inhalation is active involving many muscles and exhalation is passive.

Detailed explanation-3: -While inspiration is active, expiration is a passive process because it uses the elastic recoil of the muscles and lungs. During normal expiration, the external intercostals together with the diaphragm relax.

Detailed explanation-4: -Exhalation is a passive process because of the elastic properties of the lungs. During forced exhalation, internal intercostal muscles which lower the rib cage and decrease thoracic volume while the abdominal muscles push up on the diaphragm which causes the thoracic cavity to contract.

Detailed explanation-5: -Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction.