Epinephrine Increases Available Glucose by Binding to a Cell Surface

Multiple Choice

Epinephrine increases available glucose by binding to a cell surface receptor that activates a G protein, which then activates cAMP-dependent protein kinase, then phosphorylase kinase, and finally glycogen phosphorylase, which breaks down glycogen into glucose-1-phosphate. This is an example of

A) a network.
B) a signaling pathway.
C) crosstalk.
D) a feedback loop.