In investigating the microcirculation of the frog foot, you note the following about blood flow: ________
A) blood flow in the arterioles and venules is slow and smooth; it is very slow in the capillaries
B) blood flow in the arterioles and venules is rapid and pulsating; it is slow in the capillaries
C) blood flows smoothly through arterioles, capillaries, and venules at the same velocity
D) blood flow in the arterioles is rapid and pulsating; it is very slow in the capillaries, and slow and smooth in the venules
Answer: D
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