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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.
No, the deoxygenated blood enters and leaves the heart through the right side and the oxygenated blood enters and leaves the heart through the left side. Both sides of the hea â¦ rt are separated by a wall called a septum.lood in the arteries is oxygenated. Blood in the veins is de-oxygenated. With the exception of the pulmonary arteries which carry de-oxygenated blood, and the pulmonary veins â¦ that carry oxygenated blood.