Well, the blood has to be kept moving around all the time because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and ...

The heart is a pump, and the blood goes round, and round, and round all the time. And why does it do that? Why can't it just have a rest? Well, the blood has to be kept moving around all the time ...

carries food (nutrients) and oxygen to all the cells of the body carries away waste products that the body needs to get rid of Without a blood supply, cells and body tissues die. The blood flows ...