The skeleton consist of 206 bones. Contrary to its appearance, bone is a dynamic tissue and calcium are continuously deposited and released.
Bone cells known as osteoblasts lay down new bone while other cells known as osteoclasts resorb it.
It serves both functions mainly by adjusting the balance between bone formation-transfer mineral from blood to bone, and bone resorption-transfer mineral from bone to blood.
Both osteoblasts and osteoclasts are derived from osteoprogenitor cells originating in the bone marrow.
Calcium provides strength to the skeleton as, in conjunction with phosphorus, both these macrominerals are found on the compound hydroxyapatite, Ca10(PO4)6(OH)2, the bone hardening compound.
Bone turnover is a dynamic, continuously process, The adult skeleton is renewed about every 10 years.
Skeleton is a reservoir of calcium
