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Which one of the following statements about PTH is true?

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A fall in serum Ca²⁺ level inhibits its secretion

It inhibits the activity of osteoclasts

A rise in serum Ca²⁺ level stimulates its secretion

Along with TCT, it maintains calcium homeostasis

answer is D.

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Detailed Solution

Calcium homeostasis is maintained by PTH (hypercalcemic hormone) and TCT (hypocalcemic hormone).

PTH stimulates the activity of osteoclasts.

A fall in serum Ca²⁺ level stimulates the secretion of PTH.

A rise in serum Ca²⁺ level inhibits the secretion of PTH.

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