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