Elastic rebound occurs during which phase of breathing?

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Multiple Choice

Elastic rebound occurs during which phase of breathing?

Elastic rebound is the natural return of the lungs and chest wall to their resting sizes after they have been stretched during inspiration. When the inspiratory muscles relax, the lungs and thoracic cage recoil to their original positions. That recoil creates the pressure difference that pushes air out of the lungs, so expiration becomes largely a passive process in quiet breathing. So, the rebound happens after you’ve finished expanding the chest and lungs—that is, when the inspiratory muscles relax and return to their original position. The other ideas don’t fit: chest expansion drives inspiration, not rebound; active expiration involves muscle contraction beyond the passive recoil; and heating air in the nasal cavity has no relation to elastic rebound.

Elastic rebound is the natural return of the lungs and chest wall to their resting sizes after they have been stretched during inspiration. When the inspiratory muscles relax, the lungs and thoracic cage recoil to their original positions. That recoil creates the pressure difference that pushes air out of the lungs, so expiration becomes largely a passive process in quiet breathing.

So, the rebound happens after you’ve finished expanding the chest and lungs—that is, when the inspiratory muscles relax and return to their original position. The other ideas don’t fit: chest expansion drives inspiration, not rebound; active expiration involves muscle contraction beyond the passive recoil; and heating air in the nasal cavity has no relation to elastic rebound.

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