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12 Cards in this Set

  • Front
  • Back
What are the functions of the two subunits of the voltage gated Na+ channels?
-alpha is the main functional component
-beta contains regulatory sites
Does the voltage gated K+ or Na+ channel inactivate?
-the Na+ channel
What is a property of conductances in parallel?
-they are additive
What is the net charge movement exactly at threshold?
-one Na+ ion enters for every K+ ion that leaves
-net charge is zero
What happens to the voltage gated K+ channels during an action potential?
-they open strongly
-the resulting K+ efflux repolarizes the membrane to at least the normal resting potential
Absolute refractory period
-after an action potential this is the period of time that no depolarization (regardless of size) can elicit a 2nd action potential
Length Constant
-the distance over which passive ionic current may flow from a voltage source within an axon
-thicker axons have longer constants
Where are the Na+ channels in a myelinated axon?
-in the nodes of ranvier
Spatial Summation
-the process of combining currents from synapses at different locations in a neuron
Time constant (t)
Temporal Summation
-successive EPSPs or IPSPs can add together if they arrive at a rate close to 1/t
-larger t makes temporal summation more likely
Does the length or time constant have a greater effect on conduction velocity?
-length constant