Discussion
Which of the following characterizes human circulatory system ?
Answer: D
The human circulatory system is closed, with double circulation.
It is closed because blood always flows within vessels: arteries, capillaries and veins. It is double because blood passes through the heart twice in each complete circuit: the pulmonary circulation (heart to lungs and back) and the systemic circulation (heart to body and back).
Open circulation, where blood bathes the tissues directly, is found in insects and most molluscs. Single circulation, with one pass through the heart, is found in fishes.
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