Question

how does tunica intima of any venacava gets nutrition if it never get pure blood ?

Answer 1

Every cell of a body requires supply of oxygen and nutrient to stay alive. Capillaries which are the fine divided branches of arteriole,s supply oxygen and nutrients to all body cells.Thus, cells of tunica intima and other parts of vena cava (large veins) which always carry impure blood, also get supply of oxygen and nutrients from other blood vessels called capillaries.