04/18/2024
Oxygen-poor blood flows from the venous cavity into the pulmonary cavity; the atrioventricular valve prevents it from mixing with oxygen-rich blood from the arterial cavity. Contraction of the ventricle then pushes this blood out of the pulmonary cavity into the pulmonary artery. The atrioventricular valve then closes, allowing oxygen-rich blood from the arterial cavity to flow into the venous cavity and leave the heart through the aortic arch.