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Tonicity

Tonicity. Solutions that have the same total concentration of osmotically active solutes and the same osmotic pressure as plasma* are said to be isotonic * In the body plasma has osmolarity of 0.28 Osm (280 mOsm). Effect of isotonic solution on cell volume. 280 mOsm/L solution. Cell.

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Tonicity

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  1. Tonicity • Solutions that have the same total concentration of osmotically active solutes and the same osmotic pressure as plasma* are said to be isotonic * In the body plasma has osmolarity of 0.28 Osm (280 mOsm)

  2. Effect of isotonic solution on cell volume 280 mOsm/L solution Cell ISOTONIC No change

  3. Tonicity • Solutions that have a lower total concentration of osmotically active solutes and a lower osmotic pressure than plasma are said to be hypotonic

  4. Effect of hypotonic solution on cell volume 200 mOsm/L solution Cell HYPOTONIC Cell swells

  5. Tonicity • Solutions that have a higher total concentration of osmotically active solutes and a higher osmotic pressure than plasma are said to be hypertonic

  6. Effect of hypertonic solution on cell volume 360 mOsm/L solution Cell HYPERTONIC Cell shrinks

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