A Series of Steps Occurs Between the Arrival of an Action

Multiple Choice

A series of steps occurs between the arrival of an action potential at a presynaptic axon terminal and the initiation of an action potential in the postsynaptic neuron.What is the last step in this process?

A) Opening of Ca²⁺ channels in the presynaptic membrane
B) Fusing of synaptic vesicles with the presynaptic membrane
C) Spreading of depolarization to neighboring regions of the postsynaptic membrane
D) Influx of Na⁺,causing a graded depolarization of the postsynaptic membrane
E) Binding of acetylcholine to gated receptor proteins,allowing diffusion of Na⁺ and K⁺