Question

Arteries have thick elastic walls while veins have valves in it.Why

Answer 1

Answer:

As artery transports blood from the heart, it has a very high pressure of blood flow pumped by the heart. Artery does not need any other accessory forces to pump the blood off. In other way veins collect blood from different parts of the body where there is no such pressure except movement of body parts. To flow the blood back veins need some pressure which are created by the valves. Moreover valves help to control the one way flow of blood through the veins. Otherwise blood may start flowing backward.

As the arteries transport blood with very high pressure they have thick elastic walls to withstand the pressure.

Answer 2

Answer:

yes arteries have thick walls whereas veins have a

comparitively thinner wall because the veins carrry blood

from body parts to heart , during this , pressure is moderate

( the pressure exerted during this time is called diastolic pressure and usual range of diastolic pressure is 80 mm of Hg)

so veins have a thinner wall

But arteries have thick walls because they carry blood from

heart to differnt parts of body as heart pumps the blood , the

pressure will be high due to pumping so to overcome that

pressure arteries have a thich wall

(the pressure in arteries is called as systolic pressure which is usually 120mm of Hg)

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