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VetSkill Level 3 Diploma VN03 – Principles Of Veterinary Nursing Care 1 Practice Test

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The urinary system converts Vitamin D into which active form?
Correct Answer:
Calcitriol
Explanation:
The kidneys finish activating vitamin D to its hormonal form, calcitriol (1,25-dihydroxyvitamin D3). Vitamin D from skin or diet comes as cholecalciferol or ergocalciferol and is first converted in the liver to calcidiol. The kidneys then hydroxylate calcidiol to calcitriol, which acts to increase calcium (and phosphate) absorption from the gut and support calcium balance in the body. This makes calcitriol the active form produced through urinary-system activation. Calcitonin isn’t a vitamin D metabolite—it's a thyroid hormone. Cholecalciferol and ergocalciferol are the precursor forms of vitamin D, not the active hormone produced by the kidneys.

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