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Blood Is Moved Efficiently Through the Veins and Back to the Heart

Question 37

Multiple Choice

Blood is moved efficiently through the veins and back to the heart is by ____.


A) ​one way valves to prevent backflow
B) ​sphincter muscles to prevent backflow
C) ​contraction of the ventricles
D) ​contraction of the atria
E) blood pooling in the capillary bed​

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