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Z. Venzor

Physio ch4 vocabulary

TermDefinition
absolute refractory period time during which the local area of the membrane has surpassed the threshold potential and will not respond to any stimulus.
acetylcholine (ACh) type of neurotransmitter used by motor neurons at neuromuscular junctions to stimulate muscle contration at or in some autonomic synapses.
action potential nerve impulse: membrane potential fluctuation of an actively conducting axon.
amine organic compound containing nitrogen; neurotransmitter synthesized from amino acid molecules.
catecholamine chemical category of neurotransmitters that include norepinephrine, epinephrine, and dopamine.
convergence a coming together; also, when more than one presynaptic axon synapses with a single postsynaptic neuron .
depolarization electrical activity that triggers a contraction of the heart muscle
divergence when a single presynaptic axon synapses with more than one different postsynaptic neuron
excitatory postsynaptic potential (EPSP) temporary depolarization of postsynaptic membrane following stimulation
G protien-coupled receptor (GPCR) receptor mechanism embedded in plasma membranes of cells that receives chemical messangers and initiates signal transduction to the cell by way of a G protien, which triggers the resulting changes in the cell
hyperpolarization increase in electrical charges separated by the cell membrane; causes change further below 0 mV
Created by: 4babies
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