What causes an increase in pulmonary volume?

What causes an increase in pulmonary volume?
  1. Contraction of diaphragm
  2. Relaxation of diaphragm
  3. Contraction of external intercostal muscles
  4. Relaxation of internal intercostal muscles

Solution

The overall increase in thoracic volume caused by the contraction of the diaphragm leads to a similar increase in pulmonary volume.

Asked in: NCERT

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