The correct temporal sequence for events at the neuromuscular junction is

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[ $\mathrm{B}$ 1-6]. Acetylcholine (ACh) is stored in vesicles and is released when an action potential in the motor nerve opens $\mathrm{Ca}^{2+}$ channels in the presynaptic terminal. ACh diffuses across the synaptic cleft and opens $\mathrm{Na}^{+}$and $\mathrm{K}^{+}$channels in the muscle end plate, depolarizing it (but not producing an action potential). Depolarization of the muscle end plate causes local currents in adjacent muscle membrane, depolarizing the membrane to threshold and producing action potentials.

The Correct Temporal Sequence for Events at the Neuromuscular Junction Ca2+\mathrm{Ca}^{2+}Ca2+

The Correct Temporal Sequence for Events at the Neuromuscular Junction $\mathrm{Ca}^{2+}$