Nearly any vessel can be tied off gradually and system can enlarge alternate routes. Blood can, and does, flow in either direction in several vessels. Blood can be diverted towards or away from any ...

Why can't it just have a rest? 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 ...

This short film offers a look at respiration and a tour around the circulatory system and digestive system in the human body, through blood vessels and into mitochondria. There is a detailed ...