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Deoxygenated blood entering the heart through veins from the tissues of the body first enters the heart through the right atrium before being pumped into the right ventricle. The right atrium is one of the two atria of the heart, which function as receiving chambers for blood entering the heart.
Deoxygenated blood is carried by veins from the body to the right side of the heart. The right ventricle pumps the deoxygenated blood to the lungs via the pulmonary arteries. â¦ Oxygen diffuses into the blood in the lungs, and carbon dioxide diffuses out of the blood into the lungs.rom there, blood flows back through the pulmonary vein to the left atrium. It then travels through the mitral valve to the left ventricle, from where it is pumped through the aortic semilunar valve to the aorta.