Tagul Circulatory System Heart Video Have you ever wondered how the blood flows through your body? Watch this video and you will find out.If you still don't understand we have another video with doctors explaining how the heart works. Doctors explaining hearts The American Heart Association Bill Nye Heart Song NicerTube | Instantly Remove Comments and Distractions around YouTube™ Videos! Get rid of all the fluff, distractions and sometimes-dodgy content around YouTube videos by using NicerTube. Works like Magic!