The G protein-mediated cascade stimulated by epinephrine within a liver cell results in the phosphorylation of two key enzymes.The eventual results of this phosphorylation are the _______ of glycogen synthase and the _______ of glycogen phosphorylase, leading to the release of glucose.
A) inhibition; activation
B) activation; inhibition
C) inhibition; degradation
D) activation; activation
E) inhibition; inhibition

Question

Quizplus · Accepted Answer

The G protein-mediated cascade stimulated by epinephrine leads to the activation of glycogen phosphorylase, which breaks down glycogen into glucose, and the inhibition of glycogen synthase, which synthesizes glycogen from glucose. This ensures that glucose is released into the bloodstream for use as energy, particularly during stress or fight-or-flight responses.

The G Protein-Mediated Cascade Stimulated by Epinephrine Within a Liver