During inspiration,the volume of thoracic cav | vedclass

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Question

(A) During inspiration,the contraction of the diaphragm muscle causes it to become flat and lowered,thereby increasing the volume of the thoracic cavi

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Contraction of diaphragm and external intercostal muscles

Vedclass · Answer

(A) During inspiration,the contraction of the diaphragm muscle causes it to become flat and lowered,thereby increasing the volume of the thoracic cavity in the antero-posterior axis.Simultaneously,the contraction of the external intercostal muscles lifts the ribs and sternum up and outward,causing an increase in the volume of the thoracic cavity in the dorso-ventral axis.

During inspiration,the volume of thoracic cavity increases because of

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Expiration occurs due to

During inspiration,the diaphragm

Arrange the given steps of expiration in the sequence of events occurring first:
$I.$ Relaxation of the diaphragm and sternum
$II.$ Reduction of the pulmonary volume
$III.$ Expulsion of air from the lungs
$IV.$ Increase in intra-pulmonary pressure
Choose the correct option.

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