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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.
Confidence votes 171. 1) the deoxygenated red blood cell travels back to the heart in the vena cava. 2) it enters the right atrium. 3) the right atrium contracts and pushes it through the tricuspid and into the right ventricle, 4) the right ventricle contracts and pushes it out of the heart through the semi lunar,) here it picks up oxygen, 7) it travels back to the heart through the pulmonary vein, 8) it enters the left atrium, 9) the left atrium contracts and pushes it through the bicuspid and into the left ventricle, 10) the left ventricle contracts and pushes it through the semi lunar out of the heart and into the Aorta.