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How Are Electrical Impulses Transmitted Across Synapses?
Descri ption of what actually occurs when electrical impulses move across synapses.
Date : 02/09/2023
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Action potential opens voltage gated Ca2+ channels
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Ca2+ enters presynaptic terminal
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causes exocytosis of vesicles
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Acetylcholine diffuses across cleft at neuromuscular junction
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binds to ACh receptors and induces action potentials in muscle
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Local currents flow from polarised region and adjacent region and AP spreads along surface of muscle fibre membrane
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ACh broken down by acetylcholine esterase and muscle fibre response to that ACh molecule ceases
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