PT Osmosis, Exo&Endo - Josh Eusebio Cell Bio...

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Josh Eusebio Cell Bio 2.12.14 Chapter 5.3 [Osmosis, Endocytosis, & Exocytosis] Osmosis Water diffuses across a membrane from the hypotonic compartment into the hypertonic compartment Isotonic – when the solute concentrations on both sides of the plasma membrane are equal Hypertonic – when the solute concentration outside of the cell is higher relative to the inside of the cell Hypotonic – when the outside of the cell has a lower concentration relative to the inside Cells generally have a high internal concentration of a variety of solutes, including ions, sugars, amino acids, and so on. Animal cells must maintain a balance between the extracellular and intracellular solute concentrations ( Isotonic) o Contain transport proteins Sense changes in the cell volume Allow necessary movements of solutes across the membrane to prevent osmotic changes and maintain normal cell shape Osmoticlysis – if placed in a hypotonic medium water will diffuse into them to equalize solute concentrations; cell may take up so much water it ruptures
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