Psychology 1000 Lecture Notes - Lecture 10: Sodium-Potassium Alloy, Action Potential, Saltatory Conduction

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Laura Fazakas- De Hoog

Document Summary

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? 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 o. Nature"s first answer the non-ohmic behavior of the nerve membrane: hodgkin-huxley (1952) o. Giant axon of a squid: response of a squid axon to an external impulse at 20c. Note non-ohmic conductivity for na+ and k: 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.