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Vitamin D is unique in that it can be obtained by the diet but also is synthesized inside the body when a cholesterol-like substance is activated by sunlight and converted to the prohormone vitamin D. Check all of the organs that participate in vitamin D synthesis as a result of sunlight exposure. Check all that apply.

1. Kidneys
2. Skin
3. Bone
4. Liver

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Answer:

1. Kidneys

2. Skin

3. Liver

Explanation:

  • Vitamin D is a group pf fat soluble vitamins particularly important for the intestinal absorption of calcium, iron and magnesium.
  • Vitamin D regulates the absorption of calcium into the intestines and bones, promotes bone formation and normal function of the parathyroid gland.
  • Vitamin D is synthesized and activated in three steps:
  • The skin synthesizes Vit D upon exposure to sunlight. However, this form of Vit D, cholecalciferol is not biologically active.
  • Cholecalciferol is modified to 25hydroxycholecalciferol in the liver.
  • The final hormonally active form 1,25 dihydroxycholecalciferol is produced in the kidneys.

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