A cell with a solute concentration of 0.30mg/ml is placed in a solution with a solute concentration of 0.20mg/ml. What happens to the cell?

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First, restating the scenario: a cell with an internal solute concentration of 0.30 mg/ml is placed in an external solution of 0.20 mg/ml. In osmosis, water moves from a region of lower solute concentration to higher solute concentration in order to dilute the more concentrated side.
Option 1: Shrink. Because the outside solution has a lower solute concentration than the inside, water naturally leaves the cell to balance the concentrations. Loss of water causes the cell to shrink (crenate in animal cells).
Option 2: Expand. Expansion would occur if the external solution had a higher solute concentration than the inside, drawing water into the cell. Here that situation is reversed, so expansion is unlikely.
Option 3: Nothing. Osmosis is driven by differences in solute concentration across the membrane; a concentration gradient exists here, so water movement is expected. Therefore, this option ignores the driving force of osmosis.
Option 4: Water cannot penetrate the cell. Water does move across cell membranes via osmosis, often through aquaporins or other channels. The premise that water cannot penetrate is incorrect, especially in a typical cellular context.
In summary, based on the concentration gradient across the membrane, water will move out of the cell, leading to a reduction in cell volume. The other options either describe the opposite direction of water flow, deny an osmotic effect where a gradient exists, or falsely claim impermeability to water.

PSYCH N110-LEC-002 Chapter Assignment 4

A cell with a solute concentration of 0.30mg/ml is placed in a solution with a solute concentration of 0.20mg/ml. What happens to the cell?

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