Question: 178: Which of the following are not the effects of Parathyroid hormone?
(a) Stimulates the process of bone resorption
(b) Decreases \mathrm{Ca}^{2+} level in blood
(c) Reabsorption of \mathrm{Ca}^{2+} by renal tubules
(d) Decreases the absorption of \mathrm{Ca}^{2+} from digested food
(e) Increases metabolism of carbohydrates
Choose the most appropriate answer from the options given below:
(1) (a) and (e) only
(2) (b) and (c) only
(3) (a) and (c) only
(4) (b), (d) and (e) only
Answer: Option (4)
Explanation:
Parathyroid hormone regulates calcium and phosphate balance in the body.
It stimulates bone resorption, which releases \mathrm{Ca}^{2+} into the blood,
so statement (a) is an effect of the hormone.
Parathyroid hormone increases the blood \mathrm{Ca}^{2+} level,
not decreases it, so statement (b) is not an effect.
It increases reabsorption of \mathrm{Ca}^{2+} by renal tubules,
making statement (c) an effect of the hormone.
Parathyroid hormone increases intestinal absorption of \mathrm{Ca}^{2+} indirectly
by activating vitamin D, so statement (d) is not an effect.
Parathyroid hormone has no role in increasing carbohydrate metabolism,
so statement (e) is also not an effect.
Therefore, the statements that are not effects of Parathyroid hormone are (b), (d) and (e).