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Question

State whether the following statements are true or false.
Forceful expiration results from a forceful contraction of diaphragm.


A
True
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B
False
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Solution

The correct option is A True
  • Forced expiration is an active process. It involves contraction of the abdominal muscles which forces the diaphragm upwards reducing the volume of the thoracic cavity. 
  • It also requires contraction of the internal intercostal muscles and innermost intercostal muscles which pull the ribs downwards. Both these actions contribute to a decreased thoracic volume and pressure is inversely proportional to volume. 
  • Therefore pressure within the lungs increases forcing the air out quicker than in normal expiration.
So, the correct option is 'True'.

Biology

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