Major Ways Molecules Move Across Cell Membrane. Name five different ways that molecules can move across the cell membrane:. Cell Membranes and Fluid Balance. Composition of cell membrane? Intracellular vs. interstitial vs. extracellular fluid compartments
Name five different ways that molecules can move across the cell membrane:
Figure taken from: http://sorrel.humboldt.edu/~jlg21/Zoo%20310/Lab%202%20ADAM%20electrolytes/fluid%20compartments.gif
What are the major differences in composition of the intracellular and extracellular fluid? Between the interstitial fluid and the plasma?
Figure 5-7 (3 of 3)
The glucose transporters demonstrate common characteristics of all protein transporters:
2. Some similarly shaped molecules can bind, but when they do, transport is stopped (competitive inhibition)
Figure 5-21 - Overview
3. When the number of transporters is fixed, increasing the concentration of the transported molecule will eventually saturate the transporters, and the rate will remain at its maximum (unless more transporters are made).
How could you test whether it was primary or secondary active transport?
Figure 5-24 - Overview
What factors influence their ability to maintain their volume?
Movement of water toward the area of highest solute concentration
Osmolarity of the cell and solution surrounding it
Tonicity of the solution outside the cell
The solution with the highest solute concentration has the highest osmotic pressure
Figure 5-29 - Overview
Osmolarity = molar concentration X number of particles in solution
Osmolarity of 2M glucose? 1M NaCl? 1M MgCl2?
Tonicity describes the volume change that occur if a cell were placed in that solution, after the cell has come to equilibrium with the solution. Tonicity is not measured in units, it is only a comparative term.
Can osmolarity tell you whether a solution is hypo-, iso-, or hyper-tonic?
The relative charge difference (electrical gradient) between the intracellular and extracellular compartments.
What can influence the charges on the inside or outside of the cell?