The veins
A) act as high-resistance passageways for blood flow from the tissues to the heart
B) can serve as a blood reservoir by adjusting their total capacity to accommodate variations in blood volume
C) contain two-way valves that allow blood flow into the heart
D) all of these
E) can serve as a blood reservoir by adjusting their total capacity to accommodate variations in blood volume and contain two-way valves that allow blood flow into the heart
Correct Answer:
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