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The heart has 4 chambers and blood comes into the heart through 2 of those chambers and exits through the other 2.

Oxygen-poor blood enters the heart from the inferior vena cava and superior vena cava, into the right atrium. From there, the blood passes the tricuspid valve and enters the right ventricle. From there, the blood is pumped through the pulmonary valve into the pulmonary arteries and goes to the lungs to dispose of carbon dioxide and collect oxygen.

On the left side of the heart, oxygen-rich blood arrives from the lungs via the pulmonary veins where it passes the mitral valve to enter the left ventricle. From there, the blood is pumped through the aortic valve into the aorta.

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17y ago

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