In one heart cycle, blood flows in two directions simultaneously in humans. Oxygenated blood flows from the lungs to the heart, while deoxygenated blood flows from the heart to the lungs. Blood circulation in the human heart is called double circulation because of its double movement.
57. Why is blood circulation in the human heart called double circulation?
57. Why is blood circulation in the human heart called double circulation?
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(d) all of these