Physics 1029A/B Lecture 17: PhysicsLec24
29 Dec 2015
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Putting together what we know so far. This is the basis of the electric model of the nerve membrane: it would take these leakage processes only about one millisecond to discharge the nerve. How do we know this? o d dt. Cannot explain nerve signal transport due to the second result o o: the stimulus affects neighbouring sections of the nerve to a distance of about 0. 15 mm away form the stimulus. We understand neither without additional experimental evidence. Nature"s first answer the non-ohmic behavior of the nerve membrane o: hodgkin-huxley (1952) o, response of a squid axon to an external impulse at 20c. Note non-ohmic conductivity for na+ and k+ Giant axon of a squid: current along the axon in a nerve carrying a signal. Explains unmyelinated nerves, for some applications too slow. Nature"s second (faster) answer modify the system to lower the number of moving charges: saltatory conduction.
