Osmosis

Osmosis is when water moves from an area of high concentration of water to an area of low concentration of water through a semi-permeable membrane such as a cell membrane in an animal cell. Specifically, it is the diffusion of water as opposed to the diffusion to a solution. This allows cells to take in the correct amount of water and allow the correct amount of water to leave the cell. This means that the cell does not become 'turgid' and burst.The diagram below shows how osmosis occurs.