Physiology Endocrinology and Reproduction 1e7439e0 Which of the following is considered the active from of calcium: A Ionised calcium B Albumin bound calcium C Phosphate bound calcium D Protein bound calcium High-Yield Explanation Ans. (a) Ionised calcium(Ref: Ganong, 25th ed/p.375)Free calcium or ionized calcium is responsible for all the important actions of calcium