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Background Information Osmosis Osmosis is a type of diffusion, but only concerning water. It occurs when a membrane is partially permeable, keeping back the solutes and only letting the solvents through. Osmosis is the movement of water across a selectively permeable membrane, from an area of high water concentration to an area of low water concentration. Osmosis occurs when water is taken in or transferred from cell to cell. Diagram Examples of Osmosis: Problems caused by Osmosis in disease. 1. Kidney Disease In normal situations, plasma proteins are high in plasma. In some cases of kidney disease the plasma, proteins are reduced so the plasma becomes less concentrated. This will cause water to enter tissues from the plasma leading to oedema. (Swelling of the tissues) 2. Dehydration In cases of dehydration, water is lost from the blood. This makes the blood very concentrated. Water then leaves the tissues and enters the circulation leaving the tissues dehydrated. Osmosis...

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