Calcium (Ca) is the most abundant mineral in the body and is essential for a number of vital functions.
The skeleton contains about 99% of the body’s calcium with approximately 1kg present in adult bones. The major constituents of bone are calcium and phosphate, forming hydroxyapatite,
Calcium also plays a vital role in many systems including intracellular signalling to enable the integration and regulation of metabolic processes, the transmission of information via the nervous system, the control of muscle contraction (including the heart) and blood clotting.
Answer : (b)