1. Palomar Community College
Physiology Zoology 203
Palomar Community College
Dr. Kevin Krown
Office Hrs: during Lab
Phone:

2. Cell Membrane Transport

3. Body Fluid Compartments
Intracellular (ICF)
Extracellular (ECF)
Interstitial
Plasma
Figure 5-13

4. Overview of Movement Across Membranes
Energy requirements
Physical requirements
Figure 5-14:

5. Diffusion: Passive & down a concentration gradient
Stops at equilibrium
Rate factors: membrane, temperature, distance, & size
Figure 5-16:

6. Carrier Mediated Transport: Can be Passive or Active
Uniport
Cotransport
Symport
Antiport
Figure 5-17:

7. Facilitated Diffusion
Uses transport (integral) proteins
Passive Diffusion
Figure 5- 21:

8. Facilitated Diffusion
Figure 5-22:

9. Primary Active Transport: Pumps Products of the Cell
Na-K ATPase
Uses ATP to move products against a concentration gradient
Figure 5-23:

10. Primary Active Transport:
Figure 5-24:

12. Secondary Active Transport: Uses Energy of [ion] gradient
Na-glucose symport
Cotransports
[Ion ] restored
using ATP
Figure 5-25:

14. Energy Transfer in Cells
Cell metabolism
Membrane transport
Figure 5-26:

15. Endocytosis and Exocytosis: Movement of large molecules across membranes 3 possible mechanisms:
Phagocytosis: large particles (e.g. bacteria)
Pinocytosis: non-selective molecules
Receptor mediated: specific substrate
Exocytosis:
Export of lipophobic substances (e.g. proteins)

16. Receptor-mediated Endocytosis (LDL Receptor)
Figure 5-28: