Question

Why do arteries have thick walls and veins have thin walls?

Answer 1

because arteries face high pressure of blood from heart while veins face low pressure of blood from various organs of body

Answer 2

HERE IS YOUR ANSWER.....

Arteries are the vessels which carries blood away from the heart❤ to various organs of the body. The blood emerges from the heart❤ under high pressure. So the Arteries have thick and elastic walls.

Veins collect blood from different organs and bring it back to heart❤. They don't need thick walls because the blood is no longer under pressure. They have valves that ensure that the blood flows only in one direction.

HERE IS YOUR ANSWER.....
✌❤✌