Question

All are the functions of PTH except:

• A. PTH stimulates bone resorption/dissolution/demineralisation
• B. PTH decreases the blood calcium levels
• C. PTH increases $C{a}^{+2}$ absorption from the digested food
• D. PTH stimulates resorption of $C{a}^{+2}$ by the renal tubules

Answer 1

The correct option is B PTH decreases the blood calcium levels

The hormone released by the parathyroid glands is called the parathyroid hormone (PTH). Parathyroid hormone (PTH) increases the $C{a}^{+2}$ levels in the blood. PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation).
PTH 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 hypercalcemic hormone.