Question

Which describes the human circulatory system? A. four-chambered heart, one circulatory loop, B. four-chambered heart, two circulatory loops, C. two-chambered heart, one circulatory loop, D. two-chambered heart, two circulatory loops.

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The heart of the human being contains four chambers\text{\underline{four chambers}}: two atria and two ventricles that serves as a passageway for blood to be regulated in the heart. The whole system functions in a two-way direction\text{\underline{two-way direction}} where the arteries carry oxygenated blood away from the heart going to the body, and the veins which drain the deoxygenated blood from the body going to the heart. Hence, the answer is B\textbf{B}

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