71210 Bioelectromagnetism - Exercises Autumn 2004

Active Behavior of the Cell Membrane

1. Action impulse
   1. Obeys "all-or-nothing" law
   2. Magnitude is related to the magnitude of the stimulus
   3. Is a spontaneous property of excitable cells
2. In voltage clamping
   1. transmembrane current decreases to zero
   2. capacitive current component is negligible
   3. capacitance of the membrane is measured
3. In space clamp
   1. only radial currents arise
   2. only axial current arise
   3. capacitive currents are negligible
4. Hodgkin-Huxley membrane model aims to explain
   1. action potential generation by total and component membrane currents
   2. electrical properties of intra- and extracellular fluid
   3. the statistics of presynaptic inhibition
5. Patch clamp method was developed to
   1. repair impaired cell structures
   2. receive the Noble Prize
   3. record currents of single ion channels in the membrane

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