Summarise the transmission of an action potential across a synapse.
A.P arrives at synaptic knob. V-gated Ca2+ channels open- Ca2+ diffuses into pre-synaptic memb. Ach vesicles fuse with memb., contents released- exocytosis. Ach diffuses across synapse to post-synaptic memb. Attaches to receptors, Na+ channels open.
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