Which vessels have valves to prevent backflow of blood?
A) arteries
B) veins
C) arterioles
D) capillaries
B
Explanation:
A) Arteries do not have valves in their walls to prevent backflow.
C) Arterioles do not have valves in their walls to prevent backflow.
D) Capillaries do not have valves in their walls to prevent backflow.
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