Question

What happens to intrathoracic pressure during inspiration?

Answer 1

During inspiration, the diaphragm moves down, expanding the thoracic cavity, resulting in a decreased intra-thoracic pressure and a subsequent expansion of the lungs. ... This is because the expansion of the lungs causes pulmonary blood volume to increase and the blood flow from the lungs to the left atrium to decrease.

Answer 2

Answer:

During inspiration, the diaphragm moves down, expanding the thoracic cavity, resulting in a decreased intra-thoracic pressure and a subsequent expansion of the lungs.