Question

Name a parathyroid hormone and describe briefly its function.

Answer 1

The parathyroid glands secrete parathyroid hormone (PTH). The secretion of PTH is regulated by the circulating levels of calcium ions. Parathyroid hormone (PTH) increases the Ca${}^{2+}$ levels in the blood. PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation). PTH also stimulates reabsorption of Ca2+ by the renal tubules and increases Ca${}^{2+}$ absorption from the digested food.