Question

parathyroid is a bone sparing hormone. true or false

Answer 1

Parathyroid is a bone sparing hormone.

FALSE

Parathyroid hormone (PTH) causes bone resoption/loss.

PTH is a peptide hormone which is synthesized by chief cells of parathyroid glands. PTH secretion is mainly controlled by the concentration of free calcium (Ca2+) in plasma. Low Ca2+ levels stimulates PTH secretion and high Ca2+ will inhibit its secretion.

When plasma Ca2+ level is low

⬇️

PTH is secreted from parathyroid glands

⬇️

Helps in restoring Ca2+ levels by acting on :-

I) Bone

II) GIT

III) Renal tubules (kidney)

⬇️

Increase resoption of bone.

⬇️

Increase the free calcium level in plasma.

Thus parathyroid hormone is not a bone sparing hormone.

So, the above statement is false.