Vitamin D Sources and Functions
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Vitamin D Sources and Functions

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Questions and Answers

What is the starting point for the formation of Vitamin D?

  • Calcitriol
  • 24-hydroxylase
  • Vitamin D-binding protein
  • Chylomicrons (correct)

    • Which enzyme is responsible for hydroxylating Vitamin D at Carbon 25 in the liver?

  • NADPH-dependent enzyme (correct)
  • 1-hydroxylase
  • Vitamin D-binding protein
  • 24-hydroxylase

    • What is the end product of the metabolism of Vitamin D in the kidneys?

  • 24-hydroxylase
  • Calcitriol (correct)
  • Cholecalciferol
  • Vitamin D-binding protein

    • Which process is inhibited by 1,25-(OH)2 D3 through end product inhibition?

    <p>Transcription of 1-hydroxylase</p> Signup and view all the answers

    Which molecule transports most of the absorbed Vitamin D in the blood?

    <p>Vitamin D-binding protein</p> Signup and view all the answers

    What is the function of 1-hydroxylase in Vitamin D activation?

    <p>Converting 25-OH D3 to calcitriol</p> Signup and view all the answers

    How is 25-OH D3 primarily transported in the blood?

    <p>By DBP</p> Signup and view all the answers

    Which organ synthesizes calcitriol from 25-OH D3?

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

    What is the function of DBP in transporting Vitamin D?

    <p>(Primarily) Transporting 25-OH D3 in blood</p> Signup and view all the answers

    'PTH' plays a role in which of the following processes related to Vitamin D?

    <p>(Primarily) Stimulating calcitriol synthesis</p> Signup and view all the answers

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