Question

Short / long answer type questions.
How does the intrapleural pressure change during a normal, quiet breath?

Answer 1

At the start of inhalation, intrapleural pressure is about 756 mmHg. With the contraction of the diaphragm, it decreases to about 754 mmHg as the volume of the space between the two pleural layers expands. With relaxation of the diaphragm, it increases back to 756 mmHg.