Use These Figures to Answer the Corresponding Questions

question 63

Short Answer

Use these figures to answer the corresponding questions.
-The structure labeled "4" is
a.part of a channel that allows Na+ ions to diffuse into the ECF
b.the activation gate for a gated K+ channel
c.the inactivation gate for a gated Na+ channel
d.part of a second messenger system
e.the activation gate for a gated K+ channel and part of a second messenger system

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