Which of the following conditions will stimulate parathyroid gland...

Which of the following conditions will stimulate parathyroid gland to release parathyroid hormone?

Options

AFall in active vitamin-D levels
BFall in blood $\mathrm{Ca}^{+2}$ levels
CFall in bone $\mathrm{Ca}^{+2}$ levels
DRise in blood $\mathrm{Ca}^{+2}$ levels

Correct answer

B. Fall in blood $\mathrm{Ca}^{+2}$ levels

Step-by-step solution

The fall in blood

\mathrm{Ca}^{+2}

levels is the condition which will stimulate parathyroid gland to release parathyroid hormone. This hormone exerts its effects on bones and kidneys. When calcium levels are low, parathyroid hormone is released by the parathyroid glands into the blood and causes the bones to release calcium and increase levels in the bloodstream.

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