Aldosterone and Sodium Absorption Quiz
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Questions and Answers

What is the primary function of the large intestine?

  • Absorption of water and electrolytes, mainly NaCl (correct)
  • Transport of oxygen to the cells
  • Synthesis of aldosterone
  • Secretion of insulin

    • How does the increased sodium absorption in the large intestine affect the absorption of other substances?

  • It causes secondary increases in absorption of chloride ions, water, and some other substances (correct)
  • It has no effect on the absorption of other substances
  • It inhibits the absorption of chloride ions and water
  • It reduces the absorption of chloride ions and increases the absorption of water

    • What stimulates the synthesis of some vitamins in the colon?

  • Increased secretion of aldosterone
  • Hypertonic chyme in the lumen
  • Sluggish movements of the colon
  • Fermentation by bacteria in the colon (correct)

    • How is calcium absorption primarily regulated in the intestine?

    <p>By hormonal regulation and transepithelial transport in the duodenum</p> Signup and view all the answers

    What is the mechanism of iron absorption in the intestine?

    <p>Endocytosis of heme iron and active absorption of ionized iron by apical co-transport with hydrogen ion</p> Signup and view all the answers

    What is the role of intrinsic factor in vitamin B12 absorption?

    <p>It complexes with B12 to allow recognition by the intestinal transporter present in the ileum</p> Signup and view all the answers

    What is the primary function of bile micelles in the absorption of fat?

    <p>To facilitate the diffusion of monoglycerides and fatty acids into enterocytes</p> Signup and view all the answers

    What is the consequence of an absence of bile micelles during fat absorption?

    <p>Limited absorption of monoglycerides and fatty acids</p> Signup and view all the answers

    How does the absorption of water-soluble vitamins differ from that of fat-soluble vitamins?

    <p>Water-soluble vitamins are absorbed via a Na+-dependent cotransport mechanism</p> Signup and view all the answers

    What percentage of fat absorption is achieved in the presence of an abundance of bile micelles?

    <p>About 97%</p> Signup and view all the answers

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