Increase in cAMP is caused by-

Ans. is 'b' i.e. b (Beta) receptor Adenylyl cyclase (AC) o Activation of AC results in increased synthesis and intracellular accumulation of cAMP (by stimulatory G protein). o cAMP acts through cAMP dependent Protein Kinase 'A', which phosphorylate and alters the function of many enzymes, ion channels and structural proteins.