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Q.

During the breathing cycle, when air is taken in and let out:

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a

The lungs sometimes contain a residual volume of air

b

 The lungs always contain a residual volume of air

c

The lungs contain a residual volume of air during heavy exercise.

d

The lungs never contain a residual volume of air

answer is B.

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Detailed Solution

Residual Volume is important because it prevents the lungs from collapsing. The lungs always contain a residual volume of air so that during breathing cycle there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
 

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