Refer to the Diagram Below of a Neuromuscular Junction

Multiple Choice

Refer to the diagram below of a neuromuscular junction. Which cellular event is correctly paired with the location where it occurs?

A) Position 2 - Activated receptors open chemically gated cation channels.
B) Position 3 - Calcium triggers fusion of acetylcholine vesicles with the presynaptic membrane.
C) Position 4 - Acetylcholine is broken down and the components are recycled.
D) Position 5 - Voltage-gated calcium channels open.
E) Position 7 - Acetylcholine molecules diffuse across the synaptic cleft.