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(B) When a baby is born and takes its first breath, the lungs expand and fill with air. Even after a forceful expiration, a certain volume of air rema

Vedclass · Accepted Answer

Residual volume of air

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(B) When a baby is born and takes its first breath, the lungs expand and fill with air. Even after a forceful expiration, a certain volume of air remains in the lungs, which is known as the $Residual 	ext{ } Volume$ $(RV)$. If the baby has never breathed, the lungs remain collapsed and do not contain any $Residual 	ext{ } Volume$. Therefore, by testing the lungs for the presence of $Residual 	ext{ } Volume$ (often by checking if the lung tissue floats in water), it can be determined whether the baby had breathed or was stillborn.

If a newborn baby dies shortly after birth or is stillborn, how can it be determined whether the baby breathed or not?

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