Biology

Difference Between Endosmosis And Exosmosis

There are two types of osmosis- endosmosis and exosmosis. What is osmosis? Osmosis is a process of movement of a solvent across a semipermeable membrane to a region of higher concentration of solute and a lower concentration of solvent from a region of higher concentration of solvent and a lower concentration of solute. Endosmosis and exosmosis are two different kinds of osmosis. The major difference between endosmosis and exosmosis is that Endosmosis is the process by which water molecules enter a cell. On the other hand,
Exosmosisvis a process by which water molecules move out of the cell is called exosmosis. In this article, you will learn and understand the major differences between endosmosis and exosmosis.

Difference Between Endosmosis And Exosmosis in Tabular Form

 

Endosmosis

Exosmosis

Endosmosis is the process by which water molecules move out of the cell is called exosmosis. Exosmosis is the process by which water molecules enter a cell is called endosmosis.
The process occurs when a cell is dipped in pure water. The water molecules move out of the cell and cells become flaccid.
Cells become turgid in this process. Cells become flaccid.
Endosmosis occurs when there is lower osmotic pressure. Exosmosis occurs when the osmotic pressure is higher.
Cell shrinks for the loss of water Cell swell up.
Water potential in the cytosol is higher. Water potential is higher in the solvent outside the cell.
Example: Raisins swell when placed in pure water, absorption of water by the roots. Example: Raisins shrivel when placed in a concentrated salt solution, passage of water from root hair cells to cortical cells in plants.

The animal and plant bodies both have complex systems and the more developed the organism of study, the more is its complexity increased. E.g. in single-celled organisms, the important biological and biochemical processes take place in the cell. In higher organisms with tissue or organ level organization, the communication aspect within the cell has a very important function. Diffusion and osmosis play a key role in this regard, establishing transport systems across cells that are important for the distribution of nutrients and oxygen to the cells and the elimination of toxic waste products from them.

Read Also: What is diffusion?

Diffusion is the process of passive movement of molecules from an area of high concentration to an area of low concentration. Passive diffusion is the movement of molecules across a membrane, such as a cell membrane. The movements do not require energy.

What is Endosmosis?

Endosmosis is the process of diffusion of water into the cell from the outside. The entry of water into the cell when it is surrounded by a hypertonic solution or pure water is also called endosmosis. It occurs when there is low osmotic pressure. In this process, the solvent flows inside a vessel or cell. This phenomenon takes place when the water potential in the outside of the cell is higher than in the cytosol. However, the water molecules move inside the cell via the cell membrane (that is semipermeable in nature) and cells are swelled up because of the water entering into them and causing them to become turgid. For example, when the absorption of capillary water by roots from the soil takes place in plants and the water enters the xylem. The cell swells and becomes turgid in this process.

What is Exosmosis?

Exosmosis is the movement of water from the cell when it is surrounded by a hypertonic solution. The diffusion of water from inside to outside of a cell is also called exosmosis. The cell shrinks and becomes flaccid. In exosmosis, the direction of the water or solvent is outside of a vessel or cell. The process occurs when the water potential in the outside of the cell is lesser than inside the cells. The water molecules flow outwards from the cell by the semipermeable cell membrane during exocytosis. Therefore, the Solute concentration in the solution surrounding the cell is greater than the solute concentration in the cytoplasm. Exosmosis occurs when the osmotic pressure is high.

Conclusion

  • Endosmosis and exosmosis are both types of osmosis
  • Too much Exosmosis and Endosmosis can be dangerous
  • Endosmosis is the movement of water into a cell
  • Exosmosis is the movement of water out of a cell.
  • Endosmosis takes place if the inside of a cell is hypertonic and has a low water potential.
  • Exosmosis takes place the inside of a cell is hypotonic and has a high water potential.

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