State the differences between artery, vein and capillary.

Artery

(i) Thick-walled blood vessel


(ii) Blood flows from the heart to different parts of the body


(iii) Blood flows with high pressure with a high speed


(iv) Valves are absent


Vein


Thin walled blood vessel.


Brings blood from the different parts of the body to the heart.


Blood flows with low pressure and with a low speed.


Contains valves which permit blood flow only towards the heart.


Capillary


Thin walled and extremely narrow blood vessel.


Capillary forms an extensive network throughout all living cells in the body.


Capillaries connect arteries and veins.


Valves are absent


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