Question

What purpose is vitamin D (calcitriol) used for?

A. required for several stages of haemostasis
B. required for uptake of calcium from the gut
C. required for erythropoiesis
D. required for uptake of intrinsic factor

Answer 1

Vitamin D (calcitriol) is required for the uptake of calcium from the gut. It plays a crucial role in the absorption of calcium and phosphorous from the small intestine, as well as the reabsorption of calcium in the kidneys. Vitamin D is essential for maintaining normal serum concentrations of calcium and phosphate.

Step-by-step explanation:

Vitamin D, specifically calcitriol, is required for the uptake of calcium from the gut. It plays a crucial role in the absorption of calcium and phosphorous from the small intestine, as well as the reabsorption of calcium in the kidneys. Vitamin D is essential for maintaining normal serum concentrations of calcium and phosphate, which are important for bone health, muscle contraction, hormone secretion, and neurotransmitter release.