Red blood cells placed in a solution with the same water concentration as their cytoplasm (0.85 per cent salt solution) will not experience an overall change in volume. No osmosis occurs.

Osmosis refers to the movement of water molecules ... that are at a different concentration to the cell contents. Red blood cells lose water and shrink in a concentrated solution.

The inside of his body is known as the "City of Frank". An unlikely hero of a white blood cell named Osmosis Jones, works as a member of Immunity cell. But with that egg comes a mortal danger ...