. If intra pulmonary pressure is less than the atmospheric pressure then what happens

A. Inspiration occurs

B. Expiration occurs

C. Diffusion occurs

D. Breathing occurs

Best Answer


Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure. Inspiration begins with the onset of contraction of the diaphragm, which results in expansion of the intrapleural space and an increase in negative pressure according to Boyle's Law. This negative pressure generates airflow because of the pressure difference between the atmosphere and alveolus.


Talk to Our counsellor