Indicate the Proper Sequence of Events at the Neuromuscular Junction

question 29

Short Answer

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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