PSYC-2606EL Lecture Notes - Lecture 11: Voltage, University Of Manchester, Myelin
29 Dec 2017
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Document Summary
The change and charge in space over time; this process is manifested as current. Propagated electrical transient that moves along the axon barrel. Complex patterns of these potentials are the correlates of consciousness. Begins at axon hillock, propagates away from cell body. Refractory periods the threshold in the membrane that inhibit another discharge. Maximum firing rate of an axon, 1 khz. Absolute refractory period: 1 msec, occurs b/c there is an actual potential in progress. Relative refractory period: can exist for a few ms to hundreds of ms, due to compensatory shifts in. Portion of the axon can be propagating the potential while another part is stable. Potential difference of -70 to -90 mv across the membrane. Geometric arrangement of molecules that comprise the structure of the membrane. Na+ and other ions with high concentrations outside of the membrane move into the cell and k+ Ohmic flow, ionic current through the membrane itself.
