Question

Select the right option for the function of the labelled part (a) in the given diagram

• A. Decreases $C{a}^{+2}$ absorption from the digested food
• B. Rise in blood pressure and body temperature
• C. Increases glucose level in blood
• D. Activates reabsorption of $C{a}^{+2}$ by renal tubules.

Answer 1

The correct option is D Activates reabsorption of $C{a}^{+2}$ by renal tubules.

In the given figure the labelled part (a) represents parathyroid glands. It releases parathryoid hormones (PTH). When the blood calcium level is very low, PTH is released from parathyroid glands in order to maintain the calcium level in the body. It does this by activating the reabsorption of Ca${}^{+2}$ by renal tubules. Once, the blood calcium levels come to normal, it stops releasing PTH hormone.

Thus, the correct answer is 'Activates reabsorption of Ca${}^{+2}$ by renal tubules.'