Question

Give reasons for each of the following
1) Arteries have thick walls
2)Veins have thin walls
3)Veins have valves

Answer 1

Answer:

here u go

Explanation:

it's because Veins have thin walls because blood flows inside them with low pressure and with a low speed. Whereas arteries have thick walls because blood flows inside them with high pressure and with a high speed.

in veins their is a possibility of back flow of blood and to prevent this valves are placed

Answer 2

Explanation:

1. Arteries have thick walls because the blood in it flow at high speed and pressure .
2. veins have thin walls because the blood in veins flow smoothly st low speed and pressure .
3. veins have values because there is some percentage of blockage of vein , so values are placed