Indicate the proper sequence of events at the neuromuscular junction by filling in the blank with the appropriate number from 2 through 7. Numbers 1 and 8 are already identified.
_____ ACh is released from the axon terminal by exocytosis.
_____ An EPP takes place, primarily as a result of Na+ influx.
__8___ Acetylcholinesterase inactivates ACh, terminating activity at the neuromuscular junction.
___1__ An action potential is propagated to an axon terminal of a motor neuron.
_____ Channels that permit passage of Na+ and K+ are opened in the motor end plate.
_____ Ca2+ channels are opened in the axon terminal.
_____ Local current flow between the motor end plate and adjacent muscle-cell membrane initiates an action potential that spreads throughout the muscle fiber.
_____ ACh binds with receptor sites on the motor end plate.
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