(iii) Water moved out of the red blood cells of the person with diabetes when the concentration of glucose in the blood was above 15 mmol per dm^3 Explain why water moved out of the red blood cells of the person with diabetes.

## Step 1: The movement of water out of the red blood cells in a person with diabetes when the glucose concentration in the blood is above per can be explained by the principle of osmosis. ## Step 2: Osmosis is the process by which water molecules move from an area of lower solute concentration to an area of higher solute concentration, across a semi-permeable membrane, in this case, the membrane of the red blood cells. ## Step 3: In a person with diabetes, when the glucose concentration in the blood is high, the blood becomes hypertonic, meaning it has a higher solute concentration compared to the inside of the red blood cells. ## Step 4: As a result, to establish equilibrium, water molecules move out of the red blood cells and into the blood, causing the cells to shrink. This is a process called crenation.