Which of the Following Describes a Sequence Which Will Ultimately $\to$

Which of the following describes a sequence which will ultimately activate glycogen breakdown in a muscle?

A) epinephrine binds β receptors. $\to$ cAMP $\to$ PKA $\to$ phosphorylase kinase $\to$ glycogen phosphorylase
B) epinephrine bind α receptors $\to$ Ca²⁺ increase $\to$ phosphorylase kinase $\to$ glycogen phosphorylase
C) glucagon $\to$ glucagon receptors $\to$ cAMP $\to$ PKA $\to$ phosphorylase kinase $\to$ glycogen phosphorylase
D) PP1 binding to unphosphorylated Gm $\to$ dephosphorylates glycogen phosphorylase and phosphorylase kinase
E) All of these will activate glycogen breakdown in a muscle.

Correct Answer:

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