George Washington died after his physician treated his sore throat with bloodletting, but don't let that stop you from ...

That means that the vans are very busy indeed, all the time. So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Inside you ...

Hormones can control the body, and the effects are much slower than the nervous system, but they last for longer. There are important differences between nervous and hormonal control.