Nikolas
Created page with "== Venous circulation == The venous circulation has two roles: * To return blood from the tissues to the heart * To store blood When we talk about “storing” blood in the venous circulation we don’t mean that venous blood lies stagnated in the venous circulation. We mean rather that the diameter of the veins is very large, which means that the veins contain a lot of blood volume. === Structure of veins: === Veins have a thinner vessel wall than the arteries. Thei..."