Sequencing
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.

\begin{array}{|l|l|}\hline &\text {AChis released from the axon terminal by exocytosis. } \\\hline &\text {AnEPP takes place, primarily as a result of \( \mathrm{Na} \) influx. } \\\hline 8 &\text {A cetylcholinesterase inactivates \( \mathrm{ACh} \), terminating activity at the neuromuscular junction } \\\hline 1&\text {An action potential is propagated to an axon terminal of a motor neuron } \\\hline &\text {Channels that permit passage of \( \mathrm{Na}^{+} \)and \( \mathrm{K} \) are opened in the motor end plate. } \\\hline &\text {\( \mathrm{Ca}^{2+} \) channels are opened in the axon terminal. } \\\hline &\text {Local current flow between the motor end plate and adjac ent mus de-cell membrane initiates an action potential that spreads } \\&\text { throughout the muscle fiber. }\\\hline &\text {ACh binds with receptor sites on the motor end plate. } \\\hline \end{array}

Parasympathetic Postganglionic Fibers

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