Movement in cells

• Diffusion

  Movement of molecules from an area of higher concentration to an area of lower concentration.
• Partially permeable

  membrane that allows some substances to cross but not others.
• Osmosis

  Diffusion of water through a selectively permeable membrane
• concentration gradient

  A difference in the concentration of a substance across a distance.

  
• water potential

  the physical property that predicts the direction in which water will flow
• turgid

  swollen as from a fluid; bloated

  
• turgor pressure

  The pressure that water molecules exert against the cell wall

  
• flaccid

  (adj.) limp, not firm; lacking vigor or effectiveness
• plasmolyzed

  Hypertonic plant cell
• hypertonic solution

  Solute concentration is greater than that inside the cell; cell loses water