The lungs of a stillborn (born dead) baby

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Do not float in water because they contain no air

Float in water because they contain residual volume

Float in water because of pulmonary oedema

Do not float in water because the air in lungs equals total lung capacity

answer is A.

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Detailed Solution

The baby who is born dead never respired through the nostrils into the lungs (breathing of the baby begins only after birth). The lungs will not contain any air. Recall that the placenta aids in gas exchange for the foetus. So, such a lung with no air does not float in the water.

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