Card Set Information
Neurophysiology Sections 11-17
Resting Membrane Potential.
Spend majority of time in closed state which allows them to regulate movement of ions.
Gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.
Inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold; becomes more negative.
Moves away from resting membrane potential; becomes less negative.
Chemical element symbol for Potassium.
Open to release potassium after depolarization.
Difference in electrical potential between the interior and exterior of a cell.
Chemical element symbol for Sodium.
Open when neuron is stimulated allowing Na+ to rush in resulting in depolarization.
Period of time a cell is incapable of an action potential; amount of time it takes an excitable membrane to be ready for another stimulus.
Electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage of an impulse.
The critical level to which the membrane potential must be depolarized in order to initiate an action potential.
Changes in membrane potential that vary in size.
Change of electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell.
Phenomenon in which a nerve cell impulses completely when exposed to a threshold stimulus or not at all.
All or None Response
First location that will reach threshold.
Reversal of the resting potential in excitable cell membranes when stimulated.
In a multipolar neuron, the first part of axon (initial segment) contains many voltage-gated Na+ channels.
Period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is applied.
The period following the firing of a nerve fiber during which initiation of a second action potential is inhibited but not impossible.
Movement of an impulse along the axon.
Impulse conduction along axon that seems to jump (node to node) on myelinated axon.