junctions
- Created by: vezting
- Created on: 23-11-15 19:42
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- nerve and muscle junctions
- nerve junctions
- action potential arrives presynaptic knob.
- voltage gated Ca2 channels open, ions diffuse into knob
- Ca2 ions cause synaptic vesicles fuse with presyn membrane
- acetylcholine secreted exocytosis, diffuse across cleft
- acetylcholine bind receptors on Na channels on postsyn membrane
- Na channels open, Na ions through mebrane into neurone postsyn
- if suffi cient generator potential combine, threshold potential across membrane reached
- Na channels open, Na ions through mebrane into neurone postsyn
- acetylcholine bind receptors on Na channels on postsyn membrane
- acetylcholine secreted exocytosis, diffuse across cleft
- Ca2 ions cause synaptic vesicles fuse with presyn membrane
- voltage gated Ca2 channels open, ions diffuse into knob
- action potential arrives presynaptic knob.
- acetycholinesterase
- hydrolises acetylcholine
- choline + ethanoic acid
- re enter presyn knob diffusion, atp re combines
- choline + ethanoic acid
- hydrolises acetylcholine
- Muscular junctions
- impulse arriives neuro muscular junction. vesicles fuse presyn knob
- acetylcholine diffuse into gap
- acetylcholine binds receptors on sarcolemma, depolarisation
- depolarisation waves travel down t-system
- t-system depolarisation Ca2 release from sarcoplasmic reticulum
- Ca2 binds proteins in muscles causes contraction
- t-system depolarisation Ca2 release from sarcoplasmic reticulum
- depolarisation waves travel down t-system
- acetylcholine binds receptors on sarcolemma, depolarisation
- acetylcholine diffuse into gap
- impulse arriives neuro muscular junction. vesicles fuse presyn knob
- nerve junctions
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