_____ is the secondary messenger utilized by ACTH, FSH, LH and calcitonin hormones.
A, B and C
Secondary messengers are low-weight diffusible molecules that are used to relay signals within a cell. They are synthesized or released by specific enzymatic reactions, usually as a result of an external signal that is received by a transmembrane receptor. cAMP, cGMP and Ca2+ act as secondary messengers and are located in the cytoplasm. The hormones ACTH, FSH, LH, PTH, glucagon, and calcitonin - all utilize the cAMP pathway