Difference Between Endosmosis And Exosmosis

Before we look at the difference between Endosmosis And Exosmosis, let’s brush up the basics by knowing what exactly is “osmosis.” Osmosis is the movement of a solvent (such as water) from a low solute solution into another solution that has a higher solute concentration through a semipermeable membrane. The flow of this solution stops when equalization happens on both sides of the membrane.

Difference Between Endosmosis And Exosmosis

Difference Between Endosmosis And Exosmosis

Now that we have an understanding of osmosis, let’s find out what’s meant by Endosmosis and Exosmosis. Endosmosis is osmosis towards the inside of the cell. Exosmosis, on the other hand is the osmosis towards the outside of a cell. The other major difference between endosmosis and exosmosis are summarized below:

Difference Between Endosmosis And Exosmosis

Endosmosis

Exosmosis

The solvent moves into the cell

(Endo = inside)

The solvent moves out of the cell

(Exo = outside)

Osmosis towards the inside of a cell

Osmosis towards the outside of a cell

Occurs when there is lower osmotic pressure

Occurs when the osmotic pressure is higher

Hypotonic solutions induce endosmosis in cells (distilled water is hypotonic because it contains no solute)

Hypertonic solutions induce exosmosis in cells (Intravenous Fluid is often hypertonic as it has many solutes)

Higher water potential of the surrounding areas when compared to the cytosol (watery part of a cytoplasm in a cell)

Lower water potential of the surrounding areas when compared to the cytosol

Cells swell as result

Cells shrink as a result

Example: Raisins swell when placed in normal water

Example: Raisins shrivel when placed in concentrated salt solution

Conclusion

Endosmosis and exosmosis are two very different functions that work on the principle of osmosis. In endosmosis, the solvent moves into a cell through a semipermeable membrane from its surroundings. In exosmosis, the solvent moves out of a cell through a semipermeable membrane into its surroundings.

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