End plate potential EPP in the postsynaptic membrane

- Because the channels opened by ACh conduct both Na+ and K+ ions, the postsynaptic membrane potential is depolarized to a value halfway between the Na+ and K+ equilibrium potentials (approximately 0 mV).

- The contents of one synaptic vesicle (one quantum) produce a miniature end plate potential (MEPP), the smallest possible EPP.

- MEPPs summate to produce a full-fledged EPP. The EPP is not an action potential, but simply a depolarization of the specialized muscle end plate.

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