Which blood vessel delivers blood directly into the right atrium?

Question

Quizplus · Accepted Answer

The largest vein, the vena cava, dumps blood directly back into the heart at the right atrium.
When blood is pumped out from the heart, the left ventricle ejects blood to the body through the aorta (the body's largest artery), and then through the branching of arteries. As blood travels throughout the body, it travels through various arteries. The arteries get smaller, becoming arterioles, as they get closer to the tissues. At the tissues, oxygen and nutrients are exchanged through capillary beds. Capillaries act as transition vessels between the arteries and veins. Once the oxygen and nutrients are unloaded to the tissue, the remaining blood enters the venous circulation and travels back to the heart. Smaller veins closer to the capillary beds are called venules, becoming larger veins as they get closer to the heart. The largest vein, the vena cava, dumps blood directly back into the heart at the right atrium.
You may use the diagram below as a visual reference for how blood flows through the heart.
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Which Blood Vessel Delivers Blood Directly into the Right Atrium