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nerve impulse

QuestionAnswer
resting Na VGCP - close Na ions - no move (outside) K VGCP - close K ions - no move (inside)
reaching threshold Na VGCP - closed Na ions - some enter thru pump K VGCP - close K ions - no move (inside)
depolarisation Na VGCP - open Na ions - move in K VGCP - closed K ions - stays in
repolarisation Na VGCP - closed Na ions - no move/pumped out K VGCP - open K ions - move out
hyperpolarisation Na VGCP - close Na ions - no move/pumped out K VGCP - close K ions - pumped in
1 nerve impulse reaches axon terminal of presynaptic neuron
2 Ca2+ ions move in thru Ca2+ voltage gated channel proteins (originally out) vesicle containing neurotransmitter move toward membrane
3 vesicle fuse with membrane and releases neurotransmitter via exocytosis
4 neurotransmitter molecule diffuse across synaptic cleft along concentration gradient
5 neurotransmitter binds with specific receptor & activates new impulse
6 neurotransmitter in cleft is reabsorbed/transported & enzyme break down neurotransmitter on receptor (clearance)
Created by: wegonebefine
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