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Joseph Lococo

chapter 19

TermDefinition
Resting membrane potential Membrane voltage when the neuron is not excited and not conducting an impulse
Local potential Temporary fluctuation in a local region of the membrane in response to a sensory or nerve stimulus; may be an upward or downward fluctuation in voltage; loses amplitude as it spreads along membrane
Threshold potential Minimum local depolarization needed to trigger voltage-gated channels that produce the action potential
Action potential Temporary maximum depolarization of membrane voltage that travels to end of axon without losing amplitude
Neuron doctrine proposes neuron is basic structural and functional unit of the nervous system and neurons are independent units connected by chemical synapses
Reticular theory proposes nervous system is best understood as a large integrated network
Convergence more than one presynaptic axon synapses with a single postsynaptic neuron
Divergence a single presynaptic axon synapses with many different postsynaptic neurons
Neuropeptides large-molecule neurotransmitters
Neurotransmitters means by which neurons communicate with one another; there are more than 50 compounds known to be neurotransmitters, and dozens of others are suspected
Created by: jlococo
 

 



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