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Nervous system CH.9 lecture 2 (multiple sclerosis (relapsing-remmiting…
Nervous system CH.9 lecture 2
neurons send receive, interpret signals by generating electricity
Local potential
amount of stimulus determines excitement cell
myelinated nerves
white
unmyelinated nerves
grey
multiple sclerosis
myelin in CNS is destroyed causing slow impulse conduction
relapsing-remmiting
symptomatic flare-ups (relapse), or when pt has no symptoms (remission)
chronic progressive
no remission periods, pt becomes more disabled
gullian barre syndrome
auto-immune attack on myelin
3 phases
acute phase
initial onset, patient becomes worse
plateau phase
days to week, patient is stable
recovery phase
patient recovers function
vesicles
tiny sacs that release their contents from cell when calcium flows in
filled with molecules called neurotransmitters that send signals from neuron across synapse to next cell
neurotransmitter
bind to cell receiving signal opening and closing gates, some excite it or calm it down.
chemical synapse
use of neurotransmitters chemical that carry info from one cell to another.
electrical synapse
transfer info freely because they have special connections called gap functions
spinal cord
nerve center that controls reflexes