If body fluids are separated from pure water by a permeable membrane, there will be no net movement of water across the membrane. water will move by osmosis from the body fluids across the membrane into the pure water. the higher Nat concentration in the body fluids will cause water to move from the body fluids across the membrane into the pure water. the osmotic pressure of the pure water will cause water to move across the membrane into the body fluids. the higher ion concentration in the body fluids will cause water to move from the pure water across the membrane into the body fluids.
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