Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/12

Click to flip

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)
-t=RC
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