Number the order of the events (1-7) at the neuromuscular junction when action potential arrives at the axon terminal:
__ Action potential arrives as the axon terminal.
__ Two ACh binds to nicotinic receptor in the motor-end plate of the muscle fiber.
__ ACh is secreted from the axon terminal.
__ Action potential propagates bidirectionally along the sarcolemma down the T-tubules.
__ Calcium gated channel at the axon terminal opens.
__Na⁺ influx depolarizes the motor-end plate.
__ Influxes of calcium into the axon terminal.