Concept
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Plasma Membrane Hormone Receptors
Second messenger systems
The amino acid-derived hormones epinephrine and norepinephrine bind to beta-adrenergic receptors on the plasma membrane of cells. Hormone binding to receptor activates a G protein, which in turn activates adenylyl cyclase, converting ATP to cAMP. cAMP is a second messenger that mediates a cell-specific response. An enzyme called phosphodiesterase breaks down cAMP, terminating the signal.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, How Hormones Work. October 17, 2013."
http://cnx.org/content/m44768/latest/Figure_37_02_02.jpg
OpenStax CNX
CC BY 3.0.