First slide

Human Respiratory System

Question

The lungs of a stillborn (born dead) baby

Difficult

A

Do not float in water because they contain no air
B

Float in water because they contain residual volume
C

Float in water because of pulmonary oedema
D

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

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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