receives oxygen-depleted blood from the body via the superior vena cava and the inferior vena cava and pumps it through the tricuspid valve into the right ventricle.
receives oxygen-depleted blood from the right atrium and pumps it through the pulmonary valve into the lungs via the pulmonary artery.
receives oxygen-rich blood from the lungs via the pulmonary veins and pumps it through the mitral valve into the left ventricle.
receives oxygen-rich blood from the left atrium and pumps it through the aortic valve to be delivered throughout the body, including to the heart muscle itself via the coronary arteries.
you can check this link to see the human heart diagram :
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