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.