Zoology - Chemical Coordination and Integration Question with Solution | TestHub

Parathyroid hormone (PTH) stimulates the reabsorption of ${\mathrm{Ca}}^{2+}$ by renal tubules and increases ${\mathrm{Ca}}^{2+}$ absorption from digested food. It means PTH increases the blood ${\mathrm{Ca}}^{2+}$ level. Old aged persons have weak immunity because thymus is degenerated in old individuals resulting in a decreased production of thymosin. Oestoporosis in women occurs due to decreased level of estrogen.