osmosis is defined as a passive diffusion characterized by the passage of water, solvent through the semipermeable membrane from a dilute solution to the most concentrated. And we understand by osmotic pressure to that which would be necessary to stop the flow of water through the semipermeable membrane. When considered as semi-permeable to the plasma membrane, cells in multicellular organisms must remain in osmotic equilibrium with tissue fluids that bathe.
If the extracellular fluid increases the concentration of solutes, would be hypertonic compared to cells arise as a result of water loss and dehydration (plasmolysis)
Also Thus, if the extracellular fluids are diluted are hypotonic compared to the cells. Water tends to move to the protoplasm and cells swell and become swollen and may burst (in the case of plant cell wall cellulose forbid it), by a process of turgor.
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