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Osmosis Simulator

Discover how water moves across cell membranes and the three types of solutions that affect cell volume!

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Hypotonic Solution

Lower solute concentration outside the cell. Water moves IN, causing cells to swell.

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Isotonic Solution

Equal solute concentration inside and outside. Water moves equally, cells stay the same size.

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Hypertonic Solution

Higher solute concentration outside the cell. Water moves OUT, causing cells to shrink.

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Interactive Osmosis Simulation

Move the slider to see how a red blood cell reacts to different solute concentrations.

Isotonic (Normal)

Cell Mass: 100.0 pg
Red Blood Cell
Water
Solute