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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.

PEEBEDU Help

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

Test Your Understanding

1. A plant cell is placed in pure water. What will happen to the cell?

2. In which direction does water move during osmosis?

3. A cell placed in salt water loses mass. What type of solution is the salt water?

4. What happens to animal cells in an isotonic solution?

5. Why is osmosis important for living organisms?