Which vessel drains systemic venous blood back to the heart through the right atrium?

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Multiple Choice

Which vessel drains systemic venous blood back to the heart through the right atrium?

The main idea is systemic venous return to the heart. Deoxygenated blood from the body is collected by the large veins that drain into the right atrium. The superior vena cava brings blood from the head, neck, upper limbs, and chest, while the inferior vena cava brings blood from the lower body. Both empty into the right atrium, which is why these vessels are the proper answer for returning systemic venous blood to the heart. In contrast, the pulmonary veins carry oxygenated blood from the lungs to the left atrium, not the right. The umbilical vein is a fetal vessel and isn’t part of adult systemic venous return. The hepatic portal vein brings nutrient-rich blood from the digestive organs to the liver, not directly to the right atrium (it goes to the liver and then via hepatic veins to the inferior vena cava).

The main idea is systemic venous return to the heart. Deoxygenated blood from the body is collected by the large veins that drain into the right atrium. The superior vena cava brings blood from the head, neck, upper limbs, and chest, while the inferior vena cava brings blood from the lower body. Both empty into the right atrium, which is why these vessels are the proper answer for returning systemic venous blood to the heart.

In contrast, the pulmonary veins carry oxygenated blood from the lungs to the left atrium, not the right. The umbilical vein is a fetal vessel and isn’t part of adult systemic venous return. The hepatic portal vein brings nutrient-rich blood from the digestive organs to the liver, not directly to the right atrium (it goes to the liver and then via hepatic veins to the inferior vena cava).

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