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Physiology chap 8

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QuestionAnswer
CNS Brain & SC
PNS everything but Brain & SC
Somatic NS Skeletal muscle
Autonomic NS viscera & smooth muscle
Sympathetic Fight/flight
Parasympathetic rest and repose
cns to pns motor/efferent
pns to cns sensory/afferent
ganglia cluster of nerve cells
neuron generates nerve impulse
neuroglia glue that holds NS together
Cell body main part of neuron containing nucleus
axon "tail" of the neuron where impulse travels down
dendrite finger-like projections
Synaptic end bulb where neurotransmitters are stored
synaptic cleft space between end bulb and effector
interneuron CONNECTS CNS & PNS
Oligiodendricyte myelinates several axons in the CNS
Schwann cell myelinates on axon in the PNS
multipolar most abundant neuron, multiple dendrites off of a single cell body
Leak channels non-gated openings in the cell membrane that "leak" sodium and potassium, contribute to resting nerves
Na+/K+ pump active transport of sodium and potassium across the cell membrane
depolarization inward movement of sodium into the cell making it more positive
repolarization outward movement of potassium making the cell more negative
hyperpolarization cell is more negative than normal, takes a stronger impulse to stimulate
summation more than one stimulus to a cell
temporal summation more than one stimulus from the same source
depolarization an excitatory process
repolarization/hyperpolarization inhibitory process
absolute refractory period gates closed/no impulse possible
"C" fibers slowest nerve impulse
"A" fibers fastest nerve impulses - large and myelinated
nodes of Ranvier unmyelinated portion of axon where impulse jumps
salutory conduction jumping from node to node
ligand gates gates on cell membrane that open/close when a neurotransmitter binds to them
neurotransmitters chemical transmitters that are stored in synaptic end-bulbs
synaptic cleft space btw end bulb and effector
Created by: goodbunn
 

 



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