Table of Contents

• Developing the Equations
• 1: Review of diffusion equations
• 2: The two-compartment model
• 3: What does continuous mean?
• 4: Examples of permeability
• 5: A formula for permeability
• 6: The area of the membrane
• 7: The final equations
• Examples
• 8: Calculating molecular weight
• 9: Molarity of sugar-goo
• 10: Practicing conversions
• 11: Rate of flux
• 12: Review
• Discrete vs. Continuous
• 13: A metaphor
• 14: Continuous curves
• 15: Discrete curves
• 16: Iterating the discrete curve
• 17: Final review

Final Review

This page contains review for last part of the module: "Discrete vs. Continuous". You can find review of rest of the module by clicking here.

 

A continuous equation constantly checks its direction so its graph has no breaks. A discrete equation checks its direction at each Δt. A discrete curve may contain breaks.

In a discrete model, rate of flow across membrane is calculated at each Δt through process of iteration (repeating the last step by substituing the values calculated from last step) until equilibrium (when concentrations on both side of membrane are same) is reached. Iteration of a discrete curve yields a graph that is very similar to continuous curve.

 

 

If you want a printer-friendly version of this module, you can find it here in a Microsoft Word document. This printer-friendly version should be used only to review, as it does not contain any of the interactive material, and only a skeletal version of problems solved in the module.