Whoops! Our system was not able to recognize you as a Wisconsin resident. In order to view our licensed content you will have to register for an account to verify you are a Wisconsin resident. If you already have an account, log in.×
Blood And Circulation
Bill Nye The Science Guy Series
Join Bill Nye as he shows how valves, blood cells, and the circulatory system work together to pump it up... in the heart, that is.