Biophysics · MU Plovdiv

9. Diffusion, trans-diffusion, osmosis and filtration.

Inside: 2 sections · 10 labelled pictures · 29 flashcards · 5 min

Topic 9 of 30 in the MU Plovdiv syllabus for Biophysics (Medicine, Year 1). The free AceMed note covers it in 2 sections, about 589 words (5 min of reading), with 29 flashcards.

In this note

  1. Membrane transport 2
  2. Membrane transport 3

Membrane transport 2

Free diffusion of ions - the Nernst-Planck equation, dimensionless potential. Non-free diffusion through a pored membrane.

Non-free diffusion through a pored membrane:

To describe the transport through a pored membrane we use Fick's law, which we simplify with the following restrictions:

  1. All concentrations stay constant with time
  2. There is a linear dependence of concentration on the distance

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