3) which statement best describes arteries?
a) all carry oxygenated blood to the heart.
b) all carry blood away from the heart.
c) all contain valves to prevent the backflow of blood.
d) only large arteries are lined with endothelium.

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The answer is B which is "All carry blood away from the heart."

The walls of the arteries vs veins have different thickness in each is that tunica media is thicker than the tunica externa in arteries and that the opposite is true in veins (tunica externa is thicker than the tunica media)

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