Question

kidney blood circulation brief description​

Answer 1

Explanation:

• Arteries are the vessels which carry blood away from the heart to various organs of the body. Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls.Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction.

• Arteries divide into very fine vessels called capillaries which bring the blood in contact with the individual cells. These capillaries have one-cell thick walls which help in the exchange of material between the blood and surrounding cells. The capillaries then join together to form veins that convey the blood away from the organ or tissue.

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