Select the correct statement about hormones and their actions
Select the correct statement about hormones and their actions
Parathyroid hormone increases $\mathrm{K}^{+}$ absorption of the body.
Insulin and glucagon helps to maintain blood sugar levels.
Old aged people have weak immunity due to increased activity of thymus.
Osteoporosis in women occurs due to increased levels of oestrogens.
Solution
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.