Question

As the thoracic cavity shrinks the volume must go down and pressure goes up. If is goes above 760mmhg what happen?​

Answer 1

The relaxation of the inspiratory muscles results in a decrease in the volume of the thoracic cavity. The elastic recoil of the previously expanded lung tissue allows them to return to their original size. As per Boyle's law, a decrease in lung volume results in an increase in the pressure within the lungs.

Answer 2

Explanation:

During inhalation, the diaphragm is contracted which increases the volume of the lung cavity. During exhalation, the diaphragm is relaxed which decreases the volume of the lung cavity. ... As the intercostal muscles relax, air passively leaves the lungs. This type of breathing is also known as shallow breathing.