How can you tell epinephrine is a peptide hormone and not a steroid one by looking at the picture? The epinephrine signaling pathway plays a role in regulating glucose homeostasis in muscle cells. The signalingpathway is activated by the binding of epinephrine to the beta-2 adrenergic receptor. A simplified model of theepinephrine signaling pathway is represented in Figure 1.AdenylylCyclaseBeta-2AdrenergicReceptorEpinephrineCyclic AMPPlasmaАТРMembraneProtein Kinase AGTPATPGDPGTPADPGDP G ProteinPhosphorylase KinaseATP►ADPGlycogen PhosphorylaseGlycogenGlucose-1-PhosphateGlycolysisFigure 1. A simplified model of the epinephrine signaling pathway in muscle cells

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How can you tell epinephrine is a peptide hormone and not a steroid one by looking at the picture?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 5TAHL

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Question

How can you tell epinephrine is a peptide hormone and not a steroid one by looking at the picture?

The epinephrine signaling pathway plays a role in regulating glucose homeostasis in muscle cells. The signaling
pathway is activated by the binding of epinephrine to the beta-2 adrenergic receptor. A simplified model of the
epinephrine signaling pathway is represented in Figure 1.
Adenylyl
Cyclase
Beta-2
Adrenergic
Receptor
Epinephrine
Cyclic AMP
Plasma
АТР
Membrane
Protein Kinase A
GTP
ATP
GDP
GTP
ADP
GDP G Protein
Phosphorylase Kinase
ATP
►ADP
Glycogen Phosphorylase
Glycogen
Glucose-1-Phosphate
Glycolysis
Figure 1. A simplified model of the epinephrine signaling pathway in muscle cells

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