Question
State the differences between artery, vein and capillary.
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Artery
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Vein
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Capillary
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i.
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It is a thick walled blood vessel.
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It is a thin walled blood vessel.
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It is an extremely narrow blood vessel having very thin walls.
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ii.
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It carries blood from the heart to different parts of the body.
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It brings blood from the different parts of the body to the heart.
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They form an extensive network throughout all living cells in the body and connect arteries and veins.
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iii.
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It can dilate or constrict depending on the regulatory requirement of the body.
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It cannot dilate or constrict.
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It can dilate or constrict according to the requirement of the tissue.
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iv.
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It does not contsin any valve.
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It contains simple valves which permit blood flow only towards the heart.
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It does not contain any valves.
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