First slide

Human Endocrine System

Question

Which one of the following statements about PTH is true?

Moderate

A

A fall in serum ${Ca}^{2 +}$ level inhibits its secretion
B

It inhibits the activity of osteoclasts
C

A rise in serum ${Ca}^{2 +}$ level stimulates its secretion
D

Along with TCT, it maintains calcium homeostasis

Solution

Calcium homeostasis is maintained by PTH (hypercalcemic hormone) and TCT (hypocalcemic hormone). PTH stimulates the activity of osteoclasts. A fall in serum $C a^{2 +}$ level stimulates the secretion of PTH. A rise in serum $C a^{2 +}$ level inhibits the secretion of PTH

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