Calcium plays a very important role in the formation of bones. Write about the role of endocrine glands and hormones responsible for maintaining calcium homeostasis.
The secretion of parathyroid hormone (PTH) regulates the concentration of calcium ions, ($c{{a}^{2+}}$).
Parathyroid hormone (PTH) increases the $c{{a}^{2+}}$ levels in the blood, It acts on bones and stimulates the process of bone resorption (dissolution/ demineralisation). It also stimulates reabsorption of $c{{a}^{2+}}$ by the renal tubules and increases $c{{a}^{2+}}$absorption from the digested food. It is, thus, clear that PTH is a hypercalcaemic hormone, i.e., it increases the blood $c{{a}^{2+}}$ levels. Along with TCT, it plays a significant role in calcium balance in the body.