Exercise: Diffusion through a cell membraneΒΆ

Answers:

  1. concentration profile sketch

    diffusion through a cell membrane

  2. factors to include: membrane thickness, diffusion coefficient of urea in the membrane, area of the membrane, concentrations of urea inside and outside of the cell

  3. diffusion equation

\[\dot N_{\text{urea}} = -D_{\text{urea/membrane}} \, A_{\text{membrane}} \left( \frac{c_{\text{urea,outside}} - c_{\text{urea,inside}}}{\Delta x_{\text{membrane}}} \right)\]