adenylyl cyclase 692

agonist 683

amplification 679

antagonist 683

arrestin 698

autocrine 676

β-adrenergic receptor 687

calmodulin 679

717

cyclic adenosine monophosphate (cAMP) 679

desensitization 683

endocrine 676

epinephrine 676

glucagon 687

glycogenolysis 699

G protein–coupled receptor (GPCR) 675

heterotrimeric G protein 678

hormone 676

IP₃/DAG pathway 710

kinase 677

muscarinic acetylcholine receptor 693

nitric oxide (NO) 714

paracrine 676

phosphatase 677

phospholipase C (PLC) 692

protein kinase A (PKA) 679

protein kinase C (PKC) 714

protein kinase G (PKG) 716

rhodopsin 694

second messenger 678

signal transduction 674

transducin 694