Assertion: PTH is a hypercalcemic hormone.
Reason: Thymus degenerates in old individuals.

Options

A. Assertion and reason are both true
B. Assertion and reason are both false
C. assertion is true but the reason is false
D. assertion is false but the reason is true

Answer

A

Explanation

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 `Ca^(2+)` by the renal tubules and increases `Ca^(2+)` absorption from the digested food. it is, thus, clear that PTH is s hypercalecemic hormone, i.e., it increases the blood `Ca^(2+)` level.