How does the respiratory pump aid venous return?

Question

Quizplus · Accepted Answer

The respiratory pump aids venous return by utilizing changes in thoracic pressure during inhalation and exhalation. During inhalation, the diaphragm contracts and expands the thoracic cavity, which causes a decrease in pressure in the chest cavity and an increase in pressure in the abdominal cavity. This pressure gradient pulls venous blood from the abdominal veins toward the chest, increasing the venous return to the heart.

How Does the Respiratory Pump Aid Venous Return