What happens to venous return to the heart during inhalation?

During inhalation, the diaphragm contracts and moves downward, creating a negative pressure in the thoracic cavity. This negative pressure helps draw blood into the thoracic veins, increasing venous return to the heart. Additionally, the expansion of the chest wall during inhalation aids in enhancing venous blood flow from the peripheral veins back to the heart. Consequently, venous return is increased during inhalation.