Question

Capillaries have very thin walls whereas veins have valves. Give reason.fast answer

Answer 1

Answer:

1. Capillaries have thin walls to easily allow the exchange of oxygen, carbon dioxide, water, other nutrients, and waste products to and from blood cells.
2. Veins have valves to prevent the backflow of blood and allow the blood to flow in one direction only, because of the less pressure blood in veins (in arteries blood flows in high pressure and thus do not require valves).

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Answer 2

Answer:

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Explanation:

Main function of valve is to prevent backflow of blood. Since the blood pressure in veins is very low they have valves that prevent back flow of blood. Thus blood flows in only one direction.