Please explain the blood flow to the heart.

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Your heart does need a lot of oxygenated blood, because it distribute blood to your body. When you breathe in air, your lungs are responsible for getting that oxygen to your heart. Your heart constantly beats, and that oxygenated blood is pumped through your entire body.
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There is another part to this answer, and I can't tell if this is what you are really asking. The above poster is absolutely correct in the way that blood circulates throughout the body, and how the heart makes this happen. But the heart itself is a muscle that requires a large amount of oxygenated blood. Right after the aorta leaves the left ventricle, two coronary arteries emerge and provide blood to the heart muscle itself. Blockages in these arteries are what cause heart attacks. The closer the block is to the origin of the coronary artery, the larger the area of the heart that is no longer getting a blood supply, and the more likely the heart attack is to be fatal.

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On average, the body has five liters of blood continually traveling through it. Blood flows through the body via the circulatory system.  The circulatory system is made up largely of veins, capillaries, arteries, and the heart.

As blood begins to circulate, the heart contracts the left ventricle and blood is forced into the aorta. This blood is oxygen rich and will be pumped to all parts of the body by way of arteries.  On the way back to the heart, deoxygenated blood will travel through veins. The veins bring the deoxygenated blood back to the heart by entering the right atrium, by way of the vena cavea. The right atrium fills with this blood and contracts.  This contraction pushes the blood through a one-way valve into the right ventricle. The right ventricle contracts and forces the deoxygenated blood into the pulmonary artery, which leads to the lungs. While in the lungs a gas exchange occurs.  During this process waste leaves the blood and oxygen enters it. This oxygenated blood then leaves the lungs through the pulmonary veins and reenters the heart through the left atrium. The heart contracts and pushes the blood through a one-way valve into the left ventricle.  It is then forced into the aorta and the process repeats.

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