The blood then flows through the pulmonary valve into the pulmonary artery trunk, and next travels through the right and left pulmonary arteries to the lungs, where the blood receives oxygen during air exchange. When working properly, deoxygenated blood coming back from organs, other than the lungs, enters the heart through two major veins known as the vena cavae, and the heart returns its venous blood back to itself through the coronary sinus.įrom these venous structures, the blood enters the right atrium and passes through the tricuspid valve into the right ventricle. These electrical impulses keep your blood flowing in proper rhythm. The pulses then travel through your heart to the atrioventricular node, also called the AV node, located near the center of the heart between the atria and the ventricles. The contractions are triggered by electrical pulses that start from the sinus node, also called the sinoatrial node (SA node), located in the tissue of your right atrium. Your heart chambers fill up with blood before each beat, and the contraction pushes the blood out into the next chamber. Your atria and ventricles contract to make your heart beat and to pump the blood through each chamber. They are responsible for pumping blood into your arteries. The heart’s two ventricles are located in the bottom of the heart. They are responsible for receiving blood from your veins. The heart’s two atria are both located on the top of the heart. With the thickest muscle mass of all the chambers, the left ventricle is the hardest pumping part of the heart, as it pumps blood that flows to the heart and rest of the body other than the lungs. This chamber receives oxygenated blood from the pulmonary veins of the lungs and pumps it to the left ventricle. The pulmonary artery sends the deoxygenated blood to the lungs, where it picks up oxygen in exchange for carbon dioxide. The right ventricle pumps blood from the right atrium to the pulmonary artery. This chamber receives venous oxygen-depleted blood that has already circulated around through the body, not including the lungs, and pumps it into the right ventricle. The heart’s four chambers function as a double-sided pump, with an upper and continuous lower chamber on each side of the heart.
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