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Transport Mechanisms Across Plasma Membranes: A Comprehensive Overview

Explore the various methods of transport across plasma membranes including simple diffusion, facilitated diffusion, and osmosis. Understand the principles of Fick's Law, osmotic pressure, and different tonicity states in solutions. Learn about the key molecules and hormones involved in membrane transport. Figures from Guyton and Hall provide visual aids for clarity. Discover the intricacies of movement through lipid bilayers and channels, as well as the factors influencing diffusion rates.

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Transport Mechanisms Across Plasma Membranes: A Comprehensive Overview

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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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