Question

multiple choice question
which action would decrease intra - alveolar pressure?
o contraction of diaphragm
o relaxation of diaphragm

Explanation:

When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity. According to Boyle's law ($P_1V_1 = P_2V_2$, where pressure and volume are inversely related when temperature is constant), an increase in volume leads to a decrease in pressure. Relaxation of the diaphragm would have the opposite effect, decreasing the volume of the thoracic cavity and increasing intra - alveolar pressure.

Answer:

contraction of diaphragm