Question

Relaxation of the diaphragm and the inter-costal muscles help in :-(a) Reduction in thoracic volume(b) Increase in intra-pulmonary pressure(c) Decrease in intra-pulmonary pressure(d) Both (a) and (b)

Answer 1

ans is D

as volume decreases pressure increases as p is inversely proportional to v

relaxation of these muscles occurs during expiration

Answer 2

Here is your answer~

option (D)