The valves in the heart
Blood is pumped through the chambers of the heart aided by four heart valves which prevent the backflow of blood, ensuring a one way flow. They consist of two or three flaps (cusps) of tissue that open to let blood through then seal shut to prevent any backflow.
Tricuspid and bicuspid valves
- The tricuspid valve is located between the right atrium and right ventricle. Blood passes from the right atrium through the tricuspid valve into the right ventricle.
- The bicuspid is between the left atrium and left ventricle. After receiving a fresh supply of oxygen the blood is returned from the lungs via the pulmonary vein into the left atrium. From the left atrium the blood passes through the bicuspid valve into the left ventricle.
Semilunar valves
- The pulmonary semilunar valve is located between the right ventricle and the pulmonary artery. The right ventricle pumps blood through the pulmonary semilunar valve into the pulmonary artery which carries the blood to the right and left lungs.
- The aortic semilunar valve is located between the left ventricle and the aorta. Blood leaves the left ventricle by passing through the aortic semilunar valve into the aorta which ultimately sends the oxygenated blood out to all parts of the body.
