Figure 12-1 The Neuron

Use Figure 12-1 to answer the following questions:
-Which type of membrane channels are found at label "3"?

A) voltage-gated Na+ channels
B) voltage-gated K+ channels
C) chemically-gated Na+ and K+ channels
D) voltage-gated Ca2+ channels
E) both voltage-gated Na+ channels and voltage-gated K+ channels