What is the requirement for expiration to take place?

What is the requirement for expiration to take place?
  1. Intra-pulmonary pressure is equal to atmospheric pressure
  2. Intra-pulmonary pressure is greater than atmospheric pressure
  3. Intra-pulmonary pressure is less than atmospheric pressure
  4. Positive pressure in the lungs with respect to atmospheric pressure

Solution

Expiration takes place when the intra-pulmonary pressure is higher than the atmospheric pressure.

Asked in: NCERT

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