Which is true about the mechanism by which epinephrine stimulates glycogen breakdown?
A. This mechanism is essentially the same as that for glucagon’s stimulation of glycogen breakdown.
B. In this mechanism, epinephrine interacts with a receptor (in muscle cells) and the receptor then directly phosphorylates phosphorylase b, converted it to phosphorylase a.
C. In contrast to the mechanism for glucagon’s action, the stimulation of glycogen breakdown by epinephrine does NOT involve formation of a second messenger.
D. In the mechanism of glucagon’s action, protein kinase A directly phosphorylates phosphorylase b.
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