What happens to the thoracic and pulmonary volumes when the diaphragm and intercostal muscles relax?

What happens to the thoracic and pulmonary volumes when the diaphragm and intercostal muscles relax?
  1. They increase
  2. They decrease
  3. They stay the same
  4. They fluctuate

Solution

The relaxation of the diaphragm and intercostal muscles reduces the thoracic volume and thereby the pulmonary volume.

Asked in: NCERT

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