what are isotonic solutions?
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An isotonic solution is when two solutions, separated by a semipermeable membrane, have equal concentrations of solutes and water. Imagine you're at a party and there are an equal number of guests in the living room and in the kitchen. It doesn't make much of a difference where you stand because you are equally as comfortable in either room. You have just as much space, you can move just as easily, and you have equal access to food. You don't spend a lot of energy trying to get out of one room or into another. This party is like an isotonic solution; everything is equal from room to room.
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If the medium surrounding the cell is of exactly the same water concentration of the cell, there will be no net movement of the water across the plasma membrane.
Such a solution is called isotonic solution.
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