Diffusion and Osmosis Essay

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  • Created by: The Shrew
  • Created on: 22-04-15 09:15
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  • The process of diffusion and osmosis and its importance in living organisms.
    • What is Osmosis?
      • The diffusion of water molecules across a partially permeable membrane from an area of high water potential to an area of low water potential
      • Cholera, water potential and movement of chloride ions
      • Water entering root hair cells of a plant
      • Tissue fluid formation
    • What is diffusion
      • The net movement of particles from an area of high concentration to and area of low concentration
      • Respiration, air diffusing into blood and out of blood
      • Diffusion rate depends on area of diffusion surface, concentration gradient, and thickness of diffusion surface.
      • Movement of H+ ions in the electron transport chain in respiration
      • Sodium-potassium pumps in the nervous system
    • Facilitated diffusion; carrier proteins and protein channels- cell membrane
    • Regulates concentrations in cells
  • Plasma membrane

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