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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.
The pump on the left hand side receives oxygen-rich blood and then pumps it out into the arteries to deliver its oxygen around the body. Blood in need of oxygen enters heart. Blood in need of oxygen from around the body travels in the veins to the heart. This blood in need of oxygen (also called deoxygenated blood) is usually shown as blue or purple on diagrams. This âdeoxygenatedâ blood enters the top right hand side chamber (shown on left in diagram) of the heart, which is called the right atrium, via two large veins. Blood from the upper body, e.g. the head and arms, comes in via the superior vena cava.