What is the process of synaptic transfer? which ion is released? (5)

1) action potential goes to axon terminal 2) causes voltage gated Ca2+ channels to open 3) Ca2+ signals vesicles to travel to the presynaptic membrane and binds with it 4) NT released via exocytosis and binds with the receptors on the postsynaptic neuron 5) electrical impulse initiated in post by the NT