Veins are thin walled and have value .justify
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Veins have thin wall because blood don,t flow with high pressure in veins
A note : the “them” given after “back to” is the cells. Sorry.
Veins do not receive blood directly from heart. So, it does not have to withstand the pressure from heart. So, its walls are THIN in nature.Since it does not receive blood directly from heart, no pressure is added to the DEOXYGENATED blood flowing through veins. So, to prevent BACKFLOW of this blood back to them and further damage to cells, veins have VALVES.
Veins are thin walled because there is low blood pressure in them and to prevent the backflow of blood, they have valves.
Veins have thin walls because the blood there is no longer under pressure and they have valves to ensure blood flow in one direction.