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Transport across Plasma Membranes

Transport across Plasma Membranes. Transport across Plasma Membranes. Transport across Plasma Membranes. Diffusion through lipid bilayer. CO2 O2 NO Steroid Hormones Monoglycerides. Diffusion through channels. Simple Diffusion. Fick’s Law. J = P.∆C P = D.A/∆X J = D.A.∆C/∆X.

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Transport across Plasma Membranes

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  1. Transport across Plasma Membranes

  2. Transport across Plasma Membranes

  3. Transport across Plasma Membranes

  4. Diffusion through lipid bilayer • CO2 • O2 • NO • Steroid Hormones • Monoglycerides

  5. Diffusion through channels

  6. Simple Diffusion

  7. Fick’s Law • J = P.∆C • P = D.A/∆X • J = D.A.∆C/∆X J = Flux (Rate of diffusion) P = Permeability D = Diffusion Coefficient A = Surface area C = Concentration X = Membrane thickness

  8. Simple Diffusion

  9. Simple Diffusion

  10. Facilitated Diffusion

  11. Facilitated Diffusion

  12. Facilitated Diffusion • Aminoacids • Glucose • Galactose • Fructose

  13. Osmosis

  14. Osmosis

  15. Osmotic pressure

  16. Van’t Hoff’s Law π = RTC π : osmotic Pressure R = Gas constant T = Absolute Temprature C = Concentration

  17. Tonicity of solution

  18. Hypotonic (cell swells) Isotonic (no change) Hypertonic (cell shrinks) Figure 25-5; Guyton and Hall

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