The heart acts as a pump to deliver oxygen,nutrients and blood to different parts of the body.Both sides of the heart function together. First the oxygen-depleted blood enters the heart through two large veins, the inferior and superior vena cava and then flows into the right atrium. From the right atrium, it passes through the tricuspid valve and then into the right ventricle. The blood is then pumped through the pulmonary valve and into the lungs.
The pulmonary vein empties oxygenated blood, from the lungs, into the left atrium. Then the blood flows from your into your left ventricle through the open bicuspid or mitral valve and finally, it is pumped through the aortic valve into the aorta - the blood vessel which supplies to oxygenated blood to different parts of the body.When the ventricles are full, the mitral and tricuspid valves close. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze) or "pump." This pattern is repeated continuously throughout your life, causing blood to flow to the heart, lungs and other body parts.
The atria and ventricles work together by alternately contracting (squeezing) and relaxing to pump blood through your heart. The heartbeat is triggered by electrical impulses that travel down a special pathway through your heart. The electrical system of your heart is the power source that makes the heartbeat.
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