Inhibition of heart by vagus by M2 receptors is medicated by which mechanism?

Inhibition of heart by vagus by M2
receptors is medicated by which
mechanism?
a) cAMP
b) Cat’
c) DAG
d) None

Correct Answer - A
Ans. A. cAMP
Muscarinic receptors (cholinergic receptors) in heart are M2 type.
These are responsible for vagus mediated bradycardia.
M2 mediated actions are through cAMP