Different Blood vessels have different thickness of their walls. Choose the correct sequence in ascending order of thickness. a) Capillaries, artery, vein
b) artery, vein, capillaries
c) vein, capillaries, arteries
d) capillaries, veins, artery
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blood vessel is a tube that carries blood. Oxygen rich blood leaves the left side of the heart and enters the aorta. The aorta branches into arteries, which eventually branch into smaller arterioles. Arterioles carry blood and oxygen into the smallest blood vessels, the capillaries.
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d) capillaries, veins, artery
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