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Q.

Choose correct statement about normal expiration in humans.

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a

There is a negative pressure in lungs.

b

Diaphragm and intercostal muscles are relaxed 

c

Volume of thoracic chamber increases anteroposteriorly.

d

Abdominal muscles contract.

answer is B.

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Detailed Solution

The diaphragm and intercostal muscles are relaxed during expiration.

During inspiration:

  • There is negative pressure in lungs.
  • The volume of the thoracic chamber increases anteroposteriorly.
  • Abdominal muscles contract.
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