Lecture 36 - Action Potential Propagation and Synaptic Transmission absolute refractory period relative refractory period Propagation of the Action

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Unformatted text preview: Action Potential Propagation and Synaptic Transmission absolute refractory period relative refractory period Propagation of the Action Potential 1. Entry of Na + produces a ‘local current’ spreads laterally to depolarize adjacent areas of membrane If the adjacent membrane area is depolarized to ‘threshold’ it starts a new cycle of action potential in this ‘new’ region of membrane 2. Entry of Na + in the ‘new’ region of membrane produces a local current that spreads to adjacent areas… If the ‘new’ adjacent membrane area is depolarized to ‘threshold’ it starts a new cycle of action potential in this ‘new’ new region of membrane… + + + + + +----- Na + Na + PD these channels are ‘recruited’ out in + + + + + local depolarization opens channels electrotonic spread of depolarizing current-- + + these are not----- Na + Na + PD now these are ‘recruited’ out in + + + + + + + + + + local depolarization opens channels electrotonic spread of depolarizing current-- + + then these Continuous Conduction Velocity of Propagation...
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This note was uploaded on 09/11/2011 for the course PSIO 201 taught by Professor Stanescu during the Summer '08 term at University of Arizona- Tucson.

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Lecture 36 - Action Potential Propagation and Synaptic Transmission absolute refractory period relative refractory period Propagation of the Action

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