Question

Which of the following are not the effects of Parathyroid hormone?

1. Stimulates the process of bone resorption,
2. Decreases Ca²⁺ level in blood,
3. Reabsorption of Ca²⁺ by renal tubules,
4. Decreases the absorption of Ca²⁺ from digested food,
5. Increases metabolism of carbohydrates.

Choose the most appropriate answer from the options given below

• A. (a) and (c) only
• B. (b), (d) and (e) only
• C. a) and (e) only
• D. b) and (c) only

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Parathyroid hormone (PTH) is a hypercalcemic hormone, meaning its primary function is to increase the level of calcium (\(Ca^{2+}\)) in the blood.
Detailed Explanation:
- (a) Stimulates bone resorption: Correct. PTH acts on bones to stimulate dissolution/resorption, releasing calcium into the blood.
- (b) Decreases \(Ca^{2+}\) level: Incorrect. PTH increases blood calcium levels.
- (c) Reabsorption of \(Ca^{2+}\) by renal tubules: Correct. PTH stimulates the kidney tubules to reabsorb calcium from the filtrate.
- (d) Decreases absorption from food: Incorrect. PTH increases \(Ca^{2+}\) absorption from the digested food in the intestines.
- (e) Increases carbohydrate metabolism: Incorrect. This is not a function of PTH; it is primarily the role of hormones like insulin, glucagon, and thyroxine.
Step 2: Final Answer:
Statements (b), (d), and (e) are not the effects of PTH. Thus, option (2) is correct.