Known as varicose veins, these blood vessels, which return blood from the legs to the heart, are actually a more superficial system. The real, working venous system for the legs lies deeper ...

blood is forced upwards toward the heart. A series of one-way bicuspid valves prevents refluxing of blood back into the leg. As blood is ejected from the deep veins, venous pressure drops allowing ...

There are three types of blood vessel: arteries, veins and capillaries. The heart is a muscular organ that pumps blood around your circulatory system. The circulatory system is the heart and all ...