Question

C. Give reason: i) Arteries possess thick and more muscular wall and valves are absent.​

Answer 1

Answer:

The heart pumps blood at high pressure. If arteries have thin walls they would burst because of high blood pressure. That is why arteries have thick walls.

The valves are in the veins are thin because they handle very less pressure of blood that flows from different organs to the heart.  

Explanation:

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Answer 2

Answer:

Arteries posses thicker mascular walls because they are under much more pressure than the veins. The heart pumps blood directly into the arteries which means it has high pressure. Hence it does not need valves to control the flow of blood, on the other hands, veins have very less pressure in them because blood isn’t directly pumped into them, so they require valves to stop the blood from flowing to opposite direction.

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