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

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 ...

The circulatory system (CCEA) Blood is pumped away from the heart at high pressure in arteries, and returns to the heart at low pressure in veins. The human circulatory system is a double ...