Which vessel drains blood from the upper body into the heart?

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The main idea is identifying which vein returns blood from the upper body to the heart. The superior vena cava is the large vein that collects deoxygenated blood from the head, neck, and upper limbs (via the brachiocephalic veins) and delivers it into the right atrium of the heart. This is the pathway that completes venous return from the upper body. In contrast, the inferior vena cava handles the lower body, and arterioles are arterial vessels, while capillary exchange refers to the transfer processes at capillary walls. So the vessel described is the superior vena cava.