Choose the correct statement concerning blood vessels.
a. Venules control blood flow through capillaries.
b. Arterioles drain blood from capillaries.
c. Veins have thinner walls, but more valves than arteries.
d. Nutrient exchange may occur along arterial vessels.
e. All of the choices are correct.
Answer: c. Veins have thinner walls, but more valves than arteries.
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