Amazing 3D renderings of the inner workings of the body by Hybrid Animation.  Too slow? Switch to Low-Res Video.

Explanation: The initial sequence shows the destruction of a cancerous area as the result of the delivery of cancer-cell killing agents and the bodies natural removal of debris, after that we see an alveolus, and then a DNA/polymerase complex (either RNA or DNA), then it's a cutout of red blood cells delivering oxygen (and nutrients in the fluid) to the body in capillaries and taking away CO2 (and waste), then a zoom in to a cell to see a close up of cell membrane/receptor proteins (the proteins that get highlighted are immunoglobulin receptors), etc. etc.
(Please e-mail us with any additions/corrections.)