Learn how our bodies move blood best by building a model of the body's circulatory system--in sickness and in health. George Retseck. ... Paper. A workspace that can tolerate spills.

Physicians followed an incorrect model of the circulatory system for 1500 years (Image credit: Human heart diagram via Shutterstock) In the 2nd century, ...

Your circulatory or cardiovascular system serves a vital function by delivering oxygen and nutrients to all the organs and tissues of your body. Learn more about how the circulatory system works ...