Muscarinic cholinergic agonists: (A) Decrease production of IP 3, (B) Activate inhibitory G-proteins (Gi), (C) Decrease release of intracellular calcium, (D) Inhibit the activity of phospholipase C
Answer is B. In addition to activating inhibitory G-proteins (Gi), muscarinic cholinergic agonists stimulate the activity of phospholipase C, increase production of IP 3, and increase release of intracellular calcium. Ref:- KD Tripathi