36. The binding of ligands to many G-proteins linked receptors leads to shortlived (A) decrease in the concentration of certain intracellular signaling molecules called second messenger (B) increase in the concentration of certain intracellular signaling molecules called second messenger (C) decrease in the concentration of certain extracellular signaling molecules called first messenger increase in the concentration of certain extracellular signaling molecules called first messenger (D) increase in the concentration of certain extracellular signaling molecules called first messenger