Give reasons for the following:
Only the veins and not the arteries are provided with valves.

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Solution

Only the veins and not the arteries are provided with valves because Veins carry blood upwards away from an organ and towards the heart hence, have valves in their inner lining to prevent the backward flow of blood. But arteries carry blood downwards away from the heart and into an organ, hence, have no valves in their inner lining.

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Similar questions

Why are valves absent in arteries and present in veins?

Q. Why do veins have valves while arteries do not?

Q. Give reasons for the following
Valves are present in veins but not in arteries

Give a reason for the following:
(a) The walls of the left ventricle are thicker than the walls of all other chambers.
(b) Blood flows away from the stomach and intestines is put into circulation via the liver and not directly.
(c) The blood groups of both the donor and recipient must be known before transfusing blood.
(d) Only the veins and not the arteries are provided with a valve.
(e) Atrial wall is less muscular than the ventricular wall.
(f) The arteries are deep-seated in the body.

Q. Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

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Give reasons for the following:Only the veins and not the arteries are provided with valves.

Give reasons for the following:
Only the veins and not the arteries are provided with valves.