Anatomy for Beginners, in four parts of about one hour each (Movement, Circulation, Digestion, Reproduction).
I've watched the first two episodes so far, and they're quite informative for people whose knowledge of anatomy is sketchy, or who would like a more vivid demonstration than pictures in a textbook. The presentations center around human dissection, so if you don't want to watch that, stay away. There are also (living) nude models in case that makes a difference to somebody.
I'm placing them behind spoilers because the stills for parts 2 and 4 are rather graphic for some reason, and to help the page load faster.
I would also recommend browsing the rest of the poster's channel, which contains a number of science videos on various topics.