What is the requirement for inspiration to occur?

What is the requirement for inspiration to occur?
  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

Inspiration occurs if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure, meaning there is a negative pressure in the lungs with respect to atmospheric pressure.

Asked in: NCERT

Practice more Breathing and Exchange of Gases questions on Aicharya