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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.
It is at the level of the capillaries that oxygen blood is exchanged with carbon dioxide in each cell. The deoxygenated blood leaves the cell(s) through capillaries. The capillaries run into smaller veins and then larger ones. The veins enter the heart at the vena cava on the right side of the heart.The blood enters the right atrium of the heart from the vena cava, a large vein.ating Newest Oldest. Best Answer: In order to talk about the journey of red blood cells with reference to the lungs you need to take in consideration the right side of the heart first. Deoxygenated blood flows through your right atrium from the veins connected to the right atrium.