Artery walls have muscles that help to maintain blood pressure and pump blood through the body. The pulmonary artery from the right ventricle to the lungs is the only artery that does not carry oxygen-rich blood. The ascending aorta begins at the aortic valve, which connects the aorta to the left ventricle, and extends upward until transforming into aortic arch. Fatty plaques and scar tissue can build-up on artery walls, forming an atheroma. Common causes of atheroma.
Treatments range from prevention, to drug therapy, and coronary bypass surgery .
These specialized muscles carry the electrical stimuli which cause the heart muscle to contract. Once the AV Node receives the message to contract, it passes it on to the AV bundle which in turn transmits the message to the muscles in both ventricles. The AV Node is a group of specialized heart muscle in the lower-middle of the right atrium that serves as an electrical relay station for the heart. The sinoatrial node sends one electrical signal telling the atrium to contract and another signal to the AV Node. The AV Node then delays the signal before sending the message to the Atrioventricular Bundle .