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1.3 The Plasma Membrane, ... with a range of diverse proteins distributed…

- - - - Simple diffusion - non-polar molecules (e.g. O2, CO2, glucose)
        
        Between phosolipids
        
        Through large, open protein channels
      - Facilitated diffusion - large or polar / charged particles (e.g. K+, Na+ Cl-)
        
        Through integral protein channel in membrane; can sometimes open or close
        
        Each channel only allows a particular particle to pass
      - Osmosis (H2O only)
    - - Pumps mostly driven by ATP (e.g. Sodium (Na+) - Potassium (K+) pump)
        
        Sodium ions pumped out; Potassium ions pumped in