______Influx Triggers Fusion of Synaptic Vesicles with the Synaptic Membranes

Multiple Choice

______influx triggers fusion of synaptic vesicles with the synaptic membranes of the presynaptic cell. This same stimulus also triggers __________, releasing neurotransmitters.

A) Ca²⁺ ion, exocytosis
B) Ca²⁺ ion, endocytosis
C) acetylcholine molecules, exocytosis
D) acetylcholine molecules, endocytosis
E) Na⁺ ion, exocytosis