Figure 8.1 -What Is Occurring in Step 2 of Figure 8.1, and 8.1

Figure 8.1
-What is occurring in Step 2 of Figure 8.1, and how is that process originated?

A) fast receptor opens an ion channel that is part of the receptor : reuptake
B) slow receptor can open or close an ion channel by G protein coupling between receptor and ion channel : neurotransmitter release
C) receptor that can stimulate a cellular response by gating its ion channel : stimulating a G protein to gate an ion channel
D) influx of calcium : depolarization causes voltage- gated calcium channels to open
E) remove neurotransmitter from the synaptic cleft : reuptake