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

Your heart is an exquisitely engineered ... system using the example of a baby's first breath. Human circulatory and digestive system. videoHuman circulatory and digestive system This short ...

Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...

Your heart's will to beat ... 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.