Mineral Iron and Its Distribution in the Body
16 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What percentage of iron in the body is found in the blood?

  • 90%
  • 25%
  • 50%
  • 75% (correct)
  • Which form of iron is absorbed in the body?

  • Ferrous (Fe++)
  • Ferric (Fe++)
  • Ferrous (Fe+) (correct)
  • Ferric (Fe+)
  • What substance in the diet converts ferric to ferrous form to aid in iron absorption?

  • Oxalic acid
  • Phytic acid
  • Calcium
  • Ascorbic acid (correct)
  • Which of the following inhibits iron absorption in the body?

    <p>High fiber diet</p> Signup and view all the answers

    Where is iron absorbed from in the body?

    <p>Duodenum and Jejunum</p> Signup and view all the answers

    At which stage is iron absorption regulated rather than at excretion?

    <p>1st stage</p> Signup and view all the answers

    What substance is responsible for converting non-absorbable ferric iron into absorbable ferrous iron in the intestinal lumen?

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

    Which protein is involved in transporting bound iron from the intestinal lumen into the mucosal cell?

    <p>Divalent metal transporter-1 (DMT-1)</p> Signup and view all the answers

    What is the temporary storage form of iron within the mucosal cell?

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

    According to the mucosal block theory, what happens to iron absorption when the body's iron stores are adequate?

    <p>Iron absorption decreases</p> Signup and view all the answers

    Which protein is responsible for converting ferrous iron to ferric iron in the plasma?

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

    What is the role of erythropoietin in regulating iron absorption?

    <p>It signals the mucosal cell to increase iron absorption when body iron stores are low</p> Signup and view all the answers

    What happens at the gene level when iron concentration is high?

    <p>$Fe^{3+}$ binds to IRE-BP and prevents binding of IRE to mRNA</p> Signup and view all the answers

    What is the function of ceruloplasmin in the blood?

    <p>$Fe^{2+}$ to $Fe^{3+}$ oxidation</p> Signup and view all the answers

    In which form does iron bind with apotransferrin to form transferrin in the blood?

    <p>$Fe^{3+}$</p> Signup and view all the answers

    'Mucosal block theory' proposed by Granick suggests that _______ regulates the absorption of iron.

    <p>An adequate amount of stored iron</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser