Vitamin D and Bone Health Quiz
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Questions and Answers

What is the chemical structure of Vitamin D?

  • Tri-steroid with three fused rings
  • Tetra-steroid with four fused rings
  • Seco-steroid with one broken ring (correct)
  • Penta-steroid with five interconnected rings

    • Which food item is a poor source of dietary Vitamin D?

  • Salmon (200g)
  • Sardines (in oil) (100g)
  • Kellog’s Cornflakes (35g) (correct)
  • Mackerel (200g)

    • What is the main function of 1,25-dihydroxyvitamin D?

  • Regulate blood glucose levels
  • Mobilize iron stores
  • Support immune system function
  • Increase calcium and phosphorus absorption (correct)

    • What is the primary source of dietary Vitamin D in this text?

    <p>Supermilk</p> Signup and view all the answers

    What is the significance of 25(OH)D in the body?

    <p>It maintains serum calcium and phosphorus levels</p> Signup and view all the answers

    What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?

    <p>It is converted to preD3 in the skin</p> Signup and view all the answers

    What is the primary function of Vitamin D in the body?

    <p>Maintain bone health</p> Signup and view all the answers

    What is the percentage of Vitamin D status in Ireland based on the text?

    <p>75.6%</p> Signup and view all the answers

    What is the primary difference between Vitamin D2 and Vitamin D3?

    <p>Vitamin D2 is derived from plants, while Vitamin D3 is derived from animal sources</p> Signup and view all the answers

    What is the primary function of 25-hydroxyvitamin D in the body?

    <p>Regulating blood calcium and phosphorus levels</p> Signup and view all the answers

    What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?

    <p>It is converted to preD3 in the skin upon exposure to UVB radiation</p> Signup and view all the answers

    What is the main dietary source of Vitamin D listed in the text?

    <p>Mackrel</p> Signup and view all the answers

    What is the significance of 1,25-dihydroxyvitamin D in the body?

    <p>It increases calcium and phosphorus absorption</p> Signup and view all the answers

    What is the primary function of Vitamin D in the body?

    <p>Regulating calcium and phosphorus levels for bone health</p> Signup and view all the answers

    What is the chemical structure of Vitamin D?

    <p>Seco-steroid</p> Signup and view all the answers

    What is the primary form of Vitamin D synthesized in the skin upon exposure to UVB radiation?

    <p>D3</p> Signup and view all the answers

    What is the primary difference between Vitamin D2 and Vitamin D3?

    <p>Vitamin D3 is more readily metabolized by the liver and is considered to be the more bioavailable form of vitamin D</p> Signup and view all the answers

    What is the significance of 1,25-dihydroxyvitamin D in the body?

    <p>It helps in the absorption of calcium and phosphorus in the intestines</p> Signup and view all the answers

    What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?

    <p>It is the precursor molecule that is converted to pre-vitamin D3 in the skin upon exposure to UVB radiation</p> Signup and view all the answers

    What is the primary function of 25-hydroxyvitamin D in the body?

    <p>It is the major circulating form of vitamin D and is used to determine vitamin D status</p> Signup and view all the answers

    What is the primary source of dietary Vitamin D in this text?

    <p>Liver* (lamb)</p> Signup and view all the answers

    What is the main function of 1,25-dihydroxyvitamin D?

    <p>It regulates parathyroid hormone (PTH) secretion</p> Signup and view all the answers

    What is the chemical structure of Vitamin D?

    <p>Vitamin D has a seco-steroid structure with a broken ring</p> Signup and view all the answers

    What is the significance of 25(OH)D in the body?

    <p>It is used as a biomarker to assess vitamin D status</p> Signup and view all the answers

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