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quiz 4 notecards

ion channel

specialized protein molecule that permits specific ions to enter or leave the cell

action potential

brief electrical impulse that provides the basis for conduction of information along an axon

threshold of excitation

the value of the membrane potential that must be reached to produce an action potential

voltage dependent ion channel

an ion channel that opens or closes according to the value of the membrane potential

all or none law

principle that once an action potential is triggered, it transmits with full force to the end of the fiberout

cable properties

passive conduction of electrical current, in a decremental fashion, down the length of an axon

saltatory conduction

conduction of action potentials by myelinated axons, appears to jump from one node of ranvier to another

presynaptic membrane

membrane of terminal button lies next to postsynaptic membrane, through which NT is released

postsynaptic membrane

membrane located on the dendrite of a neuron receives info, concept of chemical transmission

postsynaptic potentials

alterations in the membrane potential of a postsynaptic neuron, produced by the liberation o fa neurotransmitter at the synapse

post synaptic receptor

receptor molecule in the postsynaptic membrane of a synapse that contains a binding site for a neurotransmitter

ionotropic receptor

receptor that contains a binding site for a neurotransmitter and an ion channel that opens when a molecules of the neurotransmitter attaches to the binding site

metabotropic receptor

receptor that contains a binding site for a neurotransmitter, activates an enzyme begins a series of events , opening an ion channel elsewhere in the membrane of the cell when a molecules of the neurotransmitter attaches to the binding site

g protein

a protein coupled to a metabotropic receptor; conveys messages to other molecules when a ligand binds with and activates the receptor

second messenger

chemical produced when a g protein activates an enzyme; carries a signal that results in the opening of the ion channel or causes other events to occur in the cell

neural integration

process inhibitory/excitatory postsynap. potentials control the rate of firing of a neuron

excitatory postsynaptic potential

EPSP excitatory depolarization of the postsynap. membrane of a synapse caused by the liberation of a NT by the terminal button

inhibitory postsynaptic potential

IPSP inhibitory hyperpolarization of the postsynap.


the reentry of a NT just freed by a terminal button back through its membrane, terminates the potential

enzymatic deactivation

destruction of a NT by an enzyme after its release, breakdown and reformed at a later time (recycling)

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