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State the differences between artery, vein and capillary.
The difference between artery, veins, and capillaries are given below:
Artery | Vein | Capillary |
(i) Artery is a thick-walled blood vessel. | The vein is a thin-walled blood vessel. | Capillary is an extremely narrow blood vessel having very thin walls. |
(ii) Artery can dilate or constrict depending on the regulatory requirement of the body. | Veins cannot dilate or constrict. | Capillary can dilate or constrict according to the requirement of the tissue. |
(iii) Artery carries blood from the heart to different parts of the body. | Veins bring blood from the different parts of the body to the heart. | Capillaries form an extensive network throughout all living cells in the body and connect arteries and veins. |
(iv) Artery does not contain any valve. | Veins contain simple valves that permit blood flow only towards the heart. | Capillaries do not contain any valves. |
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