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Z. Venzor
Physio ch4 vocabulary
| Term | Definition |
|---|---|
| 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 |
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