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The largest blood vessels in the human body are the aorta and the vena cava. The aorta is the main artery that carries oxygenated blood from the heart to the body, while the vena cava comprises two large veins (superior and inferior) that return deoxygenated blood from the body back to the heart. Both vessels play critical roles in the circulatory system, but they transport blood in opposite directions and differ in structure; the aorta has thicker, more muscular walls to withstand high pressure, whereas the vena cava has thinner walls due to lower pressure.

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2mo ago

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