The velocity of blood flow is ________.
A. in direct proportion to the total cross-sectional area of the blood vessels
B. slower in the arteries than in capillaries because arteries possess a relatively large diameter
C. slower in the veins than in the capillaries because veins have a large diameter
D. slowest in the capillaries because the total cross-sectional area is the greatest
Answer:D
The velocity of blood flow is ________.
A. in direct proportion to the total cross-sectional area of the blood vessels B. slower in the arteries than in capillaries because arteries possess a relatively large diameter C. slower in the veins than in the capillaries because veins have a large diameter D. slowest in the capillaries because the total cross-sectional area is the greatest