![]() The heart's built-in electrical system controls the speed of its pumping. It then begins its journey back to the heart, through the veins, and back into the inferior and superior vena cava for the process to begin again.Ī heartbeat is caused by an electrical impulse traveling through the heart. At the capillaries the blood delivers its supply of oxygen and picks up carbon dioxide.The aorta branches into arteries, arterioles and capillaries as it delivers blood throughout the body.After the blood passes through the aortic valve it closes to prevent backflow of blood into the left ventricle. The left ventricle, the most muscular chamber of the heart, then contracts with enough pressure to send the blood through the aortic valve and into the aorta. ![]() The mitral valve closes after the blood passes through to prevent backflow. The reoxygenated blood then flows through the mitral valve and into the left ventricle.Reoxygenated blood (red blood) leaving the lungs enters the heart through the pulmonary veins and is carried into the left atrium.In the lungs, the blood picks up oxygen and expels carbon dioxide.The two branches of the pulmonary artery carry blood to both lungs.The right ventricle pumps blood through the pulmonary valve into the pulmonary artery. Once blood passes into the pulmonary artery the pulmonary valve closes to prevent backflow of blood into the right ventricle.The right ventricle fills and contracts to pump blood to the lungs.This oxygen-poor blood then passes through the tricuspid valve into the right ventricle. The tricuspid valve closes after the blood passes through to prevent it from flowing back into the right atrium.The two largest veins in the body, the superior and inferior vena cava, bring the oxygen-poor (blue) blood to the heart into the right atrium.The four chambers of the heart are attached to major veins or arteries that either bring blood into or carry blood away from the heart. How blood circulates through the heart and body The aortic valve is located between the left ventricle and the aorta.The mitral valve is between the left atrium and the left ventricle. ![]()
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