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Question: 1 / 400

What is the initial entry point for deoxygenated blood into the heart?

Left atrium

Right ventricle

Superior vena cava

The initial entry point for deoxygenated blood into the heart is the superior vena cava. This large vein is responsible for returning deoxygenated blood from the upper body, including the head, neck, arms, and upper chest, back to the right atrium of the heart. The superior vena cava plays a crucial role in the circulatory system by funneling the blood that has delivered oxygen to the tissues and is now low in oxygen back to the heart for re-oxygenation.

Once the blood enters the right atrium, it is then directed into the right ventricle, which pumps it to the lungs via the pulmonary artery for oxygenation. Hence, the superior vena cava is a vital component in the pathway that facilitates the heart's function as a pump for both circulations — the systemic and pulmonary.

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Pulmonary artery

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