A pig's heart. Here are the bovine semilunar valves.
Oxygenated blood returns to the left atrium in the pulmonary veins , through the bicuspid valve .
Here is the bovine pulmonary vein . Here is the bovine bicuspid valve . The atrium fills the left ventricle , and oxygenated blood is then pumped through the aorta to the body tissues. Here is the bovine aorta . The aorta branches to form the major arteries.