Of course, untreated porcine tissue would be rejected very quickly by the recipient's body, in the same way that a human's donated organ would be rejected. To prevent this, porcine heart valves are treated with glutaraldehyde to reduce their immunogenicity. The muscle of your heart is called the myocardium. Most of the myocardium is located in the ventricles which are roughly the size of your fist. The porcine heart, like a human heart, has four chambers and four valves .
Blood flows through the pig heart in the same manner as through a human's.
This picture shows the pig heart from the front, with the portion on the right of the picture being the left side of the heart and vice versa. The aorta is clearly visible at the top, with an atrium on either side, while the ventricles are in the bottom left. A top view shows the aortic and pulmonary arteries as well as the pulmonary veins and superior vena cava. The first incision is along the right ventricle, allowing us to see inside the right side of the heart. The right ventricle can be identified by squeezing the heart, since the myocardium on the right side is much less rigid than that of the left ventricle.