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Lecture

PSL 300 Lecture 3

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Department
Physiology
Course
PSL300H1
Professor
Gillian Mac Kay
Semester
Fall

Description
PSL 300 LECTURE 3CONDUCTION OF ACTION POTENTIALElectrical ConductionUsed because it is super FASTLow current densities do not cause any tissue damageAlternativeion diffusion but TOO slow and wont diffuse far before being bound or transported outCable PropertiesThe conduction velocity of an AP along an axon depends on the membrane length constantmeasures how quickly a potential difference decays to zero as a function of distance is increased by increasingAxon DiameterMembrane Resistance via myelination Length ConstantRResistance Mmembrane and IinsideMeasure of passive spread of electrical current as in any conductorSpread of depolarizing current is MyelinationIncreasing membrane resistance is the most efficient means of increasing conduction velocitySpecialized glial cells wrap around successive sections of an axonmyelin sheathCNSoligodendrocytes PNSSchwann cellsA small gap left between adjacent glial cells the only
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