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. Simple Diffusion through channels

6. Simple Diffusion

8. 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

9. Simple Diffusion

10. Simple Diffusion

11. Facilitated Diffusion

12. Facilitated Diffusion

13. Facilitated Diffusion
Aminoacids
Glucose
Galactose
Fructose

16. Osmosis

17. Osmosis

19. Osmotic pressure

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

21. Tonicity of solution 21

22. Hypotonic (cell swells) Isotonic (no change) Hypertonic (cell shrinks)
Figure 25-5; Guyton and Hall 22