Respuesta :
Epinephrine
Explanation:
Epinephrine uses classical G protein coupled receptor (GPCR) signaling pathway by four different types of membrane receptors in different tissues:
[tex]\alpha[/tex]1,[tex]\alpha 2[/tex], [tex]\beta 1[/tex] and [tex]\beta 2[/tex] Â
Binding of non-epinephrine or epinephrine to an [tex]\alpha 2[/tex] receptor activates an inhibitory G protein called GI, GI activates cyclic nucleotide phosphodiesterase enzyme which converts cyclic AMP to 5' AMP thus destroys secondary messenger(cAMP)
[tex]\beta 1[/tex] receptor associated trimeric G protein is GS which activate adenylate cyclase enzyme which catalyze production of a potent secondary messenger called cAMP
Answer:
α2 : β1
Explanation:
1. Norepinephrine and  epinephrine are very similar neurotransmitters and hormones. Â
2. Epinephrine has slightly more of an effect on heart, Â while norepinephrine has more of an effect on blood vessels. Both play a role in body's natural fight-or-flight response to stress and they also have important medical uses as well.
3. Binding of norepinephrine or epinephrine to an α2 receptor will activate an inhibitory G protein ( a G protein coupled receptor) which decreases the activity of adenylate cyclase and so on cAMP synthesis, and while the binding of these two neurotransmitters to a β1  receptor will do the exact opposite effect.
