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Unformatted text preview: say that an ion satisfies the Nernst equation? 7. Chambers A and B are separated by a membrane. Chamber A contains 1 M KNO 3 . and chamber B contains 0.1 M KNO 3 . If K+ is in equilibrium across the membrane, what is the electrical potential difference, EA EB? Which side is electrically positive? 8. In some ion channels, the conductance of the channel can be voltage sensitive. This will be explored further with the Hodgkin-Huxley model. Below, two types of voltage sensitive channels are shown in terms of conductance (in units of mho or Siemens, which is 1/resistance in ohms). Sketch the current-voltage (IV) curves for both ion channels if the reversal potential is -80 mV and +30 mV. Note that I should be on the y-axis and V on the x-axis. 1.0 0.75 0.5 0.25 0.0 -80 -40 0 40 80 g(V) V (mV) 1.0 0.75 0.5 0.25 0.0-80 -40 0 40 80 g(V) V (mV) A. B....
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- Fall '07