Which one of the following acts to increase the release of Ca2+ from endoplasmic reticulum: (A) Inositol triphosphate, (B) | Parathyroid hormone, (C) 1,25 - dihydroxy choleciferol, (D) Diacyglycerol
Answer is A. Ans. (a) Inositol triphosphate(Ref: Ganong, 25th ed/p. 116)Inositol triphosphate acts on the sarcoplasmic reticulum to release calcium ions