IT IS USED IN FERTILISERS. IT IS ALSO USED AS AN ANTOXIDANT IN BAKING POWDERS AND FLOURS AND AS A SOURCE OF CALCIUM IN SOME MINIERAL SUPPLEMENTS AND HELPS IN BONE MINERALIZATION. CALCIUM IS THE FIFTH MOST ABUNDANT ELEMENT IN THE BODY. CALCIUM IS A DIVALENT METAL ESSENTIAL FOR THE MAINTENANCE OF THE NERVOUS, MUSCULAR, AND SKELETAL SYSTEMS, AND FOR CELL MEMBRANE AND CAPILLARY PERMEABILITY. ITS ROLE IN BONE STRUCTURE AND MUSCLE CONTRACTION IS WELL KNOWN, BUT CALCIUM IS ALSO IMPORTANT FOR BLOOD COAGULATION, NERVE CONDUCTION, AND ELECTRICAL CONDUCTION IN THE HEART.