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• Four types of valves regulate blood flow through your heart: • The tricuspid valve regulates blood flow between the right atrium and right ventricle. • The pulmonary valve controls blood flow from the right ventricle into the pulmonary arteries, which carry blood to your lungs to pick up oxygen. • The mitral valve lets oxygen-rich blood from your lungs pass from the left atrium into the left ventricle. • The aortic valve opens the way for oxygen-rich blood to pass from the left ventricle into the aorta, your body's largest artery, where it is delivered to the rest of your body • The muscular walls of the heart is composed of three layers and surrounds a cavity. • This cavity is sectioned into four chambers: the left and right atria, located at the top of the heart, and the left and right ventricles positioned below. • The atria receives blood from the body while the ventricles pumps blood to the lungs and the cells. • the valves operate in one direction only. This prevents a “back-flow” of blood back into the atrium. • From the right ventricle, blood is directed to the lungs where it becomes oxygenated. • The blood must first travel back to the left atrium through the four pulmonary veins - two veins from the left lung and two veins from the right lung. • The left atrium is smaller than its counterpart, however, the walls are slightly thicker. • As the left atrium is filled with blood from the lungs, a pressure gradient is formed and causes the atrioventicular (bicuspid) valve to open. • This one way valve directs the blood into the left ventricle where it is pumped to all parts of the body. • The Aorta, the largest artery in the body, is responsible for directing the blood. • The left ventricle is the strongest chamber with the thickest walls to ensure that as the blood is pumped it reaches all extremities. Heart Valves