How are inspiration and expiration carried out?

How are inspiration and expiration carried out?
  1. By creating pressure gradients between the atmosphere and the alveoli
  2. By utilising specialised cells
  3. By utilising oxygen
  4. By estimating air volume

Solution

Inspiration and expiration are carried out by creating pressure gradients between the atmosphere and the alveoli with the help of specialised muscles - intercostals and diaphragm.

Asked in: NCERT

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