A person suffering from kidney failure undergoes dialysis treatment. In this procedure, waste is filtered out of the blood via dialysis machine that use artificial membranes. Are these membranes permeable or impermeable? Explain your answer.
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Cell membranes are semi-permeable. Just like your private dinner party, only certain molecules can cross the cell membrane. This allows the cell some control over what enters and leaves. Water, small molecules, and molecules without a charge can pass freely.