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Example Question #21 : Transport And Signaling
Which of the following is NOT an example of a second messenger?
Possible Answers:
IP3
Epinephrine (adrenaline)
cAMP
Ca2+
All of these are second messengers.
Correct answer:
Epinephrine (adrenaline)
Explanation:
Second messengers are intracellular signaling molecules. Epinephrine is a hormone that is released into the bloodstream and is thus never inside the cell. cAMP, Ca2+ and IP3 are all examples of second messengers. They respond to primary messengers—which are often hormones—by amplifying their effects and/or turning on downstream effectors.
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