Question

Which of the following is not associated with parathyroid hormone (PTH)?

• A. It promotes release of $C{a}^{2+}$ from bone matrix into the blood
• B. It stimulates kidney to release calcitriol
• C. More PTH is released when blood calcium level rises
• D. Hypoparathyroidism result in parathyroid terany

Answer 1

Answer: (B)

It stimulates kidney to release calcitriol

• Parathyroid hormone- It is also known as parathormone or parathyrin.
• It is a secreted by the parathyroid glands.
• Its main function includes bone remodelling by releasing more PTH when the calcium in our blood goes too low, which increases the blood calcium level that is released from bones.
• This hormone stimulates calcitriol production in the kidney as it synthesises 1-α hydroxylase and also maintains calcium levels by increasing calcium absorption in the gastrointestinal tract
• Hypoparathyroidism- leads to low levels of calcium in the blood which causes cramps and twitches in muscles or tetany.
• So, the correct answer is 'More PTH is released when blood calcium level rises'.