The Biology Project
Cell Signaling > Problem
10: Signaling Events
In a fight-or-flight response, epinephrine released by the adrenal glands binds
to a membrane receptor on muscle cells. Which of the following events
result from ligand binding?
| Tutorial | Problem 11
||G-protein is activated by binding GTP and causing
adenylyl cyclase to produce cAMP.
||The second messenger, cAMP, activates protein kinase
A which inhibits glycogen synthetase blocking glycogen synthesis.
||Protein kinase A activates phosphorylase kinase, which
transfers a phosphate that activates glycogen phosphorylase. This
leads to the breakdown of glycogen and the production of glucose-1-phosphate.
||Glucose produced from glucose-1-P stimulates glycolysis,
producing energy for muscle contraction.
All of the above.
Yes, the response to epinephrine in liver
and muscle is an example of a cascade that causes a number of
enzyme changes to insure that free glucose is available for
glycolysis in muscle tissue.
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