3. The diagram to the right depicts a cell submerged in a solution. The cell membrane is permeable to water but not to sugar. Start by completing the % concentrations of water of the intracellular and extracellular solutions. a) What is the cytosol in this example? (circle the correct term below) hypotonic hypertonic b) How do you know? isotonic 30% Sugar % Water d) Predict: What is going to happen to the size(mass) of the cell? 60% Sugar % Water c) Because the solutions are not isotonic, osmosis is going to occur. In what direction is water going to move? e) Predict: What is going to happen to the extracellular solute concentration?

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.