Why is Osmosis Jones wrongly titled?

Answer 1

Osmosis is the diffusion of water through a membrane. Diffusion is when particles move from a higher concentration to a lower concentration without the use of any energy. So, in the movie, Osmosis Jones is really a white blood cell (a cell that combats "evil" disease or illness. The the movie would have been titled fine as Osmosis Jones if Osmosis simple diffused from one place to another inside the body. However, that would have been really boring and the studios would have lost their shirts!