Why does blood velocity decrease as it flows into a capillary bed?
A. The diameter of the capillaries is smaller than that of the arterioles and arteries.
B. The cross-sectional area of the capillary beds is approximately 2000 than that of the aorta.
C. The arteries are constricted.
D. The pressure is much higher in the capillaries.
Answer: B. The cross-sectional area of the capillary beds is approximately 2000 than that of the aorta.
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