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Propagation

QuestionAnswer
What is AP Propagation? transfer along an Axon
What is Saltatory Propagation? repeated REGENERATION of AP's at each Node along an Axon
What is the significance of Saltatory Propagation? FASTER propagation velocity (skips though Axon), uses LESS ATP (Na+/K+ pump)
What are the steps of Saltatory Propagation? Stimulation --> Na+ gates OPEN --> Na+ INFLUX --> Depolarization --> + Ions flow away from activated area to next Node
What is meant by Decremental? 50% DECLINE in Amplitude in Saltatory Propagation
What is the definition for Refractory Period? time of membrane Depolarization and Hyperpolarization
What is the significance of the Refractory Period? 1. period of INSENSITIVITY to Stimuli; 2. limits maximum AP Frequency; 3. assures UNIDIRECTIONAL AP Propagation
What would be the result of not have Nodes? NO Nodes --> AP needs to open Na+ ans K+ channels themselves --> uses ATP and takes a lot of TIME
What would happen if the nodes were further than 1mm apart? current may be Subthreshold
Created by: Kristel