Find out about the different stages of a human life cycle and how we change as we ... Discover how the food gets into the body, through the digestive system. What happens to food in your mouth?

Because metabolic rate depends predictably on both body size and temperature ... They emit the oxygen that sustains animal life. Animals eat plants, eat each other, expel carbon dioxide and ...

videoSkin and sweating This short film combines CGI images with a real life story about a fire-fighter to show how the body manages to control temperature by sweating. The human ear. videoThe ...

He is the first astronaut to participate in a study examining how exercising with limited gym equipment can affect the human body. While the ... in muscle function and size.