Question

Assertion : $PTH$ is a hypercalcemic hormone.
Reason : $PTH$ stimulates the process of bone resorption.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

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, i.e ., it increases the blood $C{a}^{2+}$ level.