Question

The vitamin which works along with para thyroid hormone is

• A. Vitamin C
• B. Calciferol
• C. Tocopherol
• D. Vitamin - $B_{12}$

Answer 1

The correct option is B Calciferol

A fall in the concentration of calcium in the bloodstream is detected by the parathyroid glands, which then produce parathyroid hormone.

Parathyroid hormone increases the activity of the enzyme 1-hydroxylase, which produces active vitamin D. This increase in the concentration of calcium together with vitamin D feeds back to the parathyroid glands to stop further parathyroid hormone release. The production of vitamin D is also directly regulated by calcium, phosphate and calcitriol.