Which of the following is not a possible circulatory route from the heart?
A. Heart ? arteries ? capillary bed ? vein ? capillary bed ? veins ? heart
B. Heart ? arteries ? capillary bed ? veins ? heart
C. Heart ? arteries ? arterial anastomosis ? capillary bed ? venous anastomosis ? veins ? heart
D. Heart ? arteries ? capillary bed ? vein ? capillary bed ? arteries ? heart
E. Heart ? arteries ? arterial anastomosis ? capillary bed ? veins ? heart
Answer: D
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