Renal Physiology and Ion Reabsorption
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Questions and Answers

What is the primary effect of Ang-II on the kidneys?

  • Increasing water excretion
  • Inhibiting glomerular filtration rate
  • Reducing aldosterone release
  • Stimulating Na reabsorption from the renal tubule (correct)

    • What is the primary route of Cl- reabsorption in the late proximal tubule?

  • Through the collecting duct
  • Paracellular route
  • Transcellular route via CFEX (correct)
  • Via the thick ascending limb of the loop of Henle

    • What is the consequence of Cl- reabsorption in the proximal tubule?

  • Increased excretion of Na+ and K+
  • Favoring Na reabsorption (correct)
  • Inhibiting water reabsorption
  • Reduced reabsorption of Na+ and K+

    • What is the primary function of Cl- channels in the kidney?

    <p>Reabsorbing Na+ and Cl- in the thick ascending limb</p> Signup and view all the answers

    What is the primary mechanism of calcium and phosphate regulation in the body?

    <p>A balance of all of the above</p> Signup and view all the answers

    What is the approximate percentage of total body phosphorus found in the plasma?

    <p>1%</p> Signup and view all the answers

    What is the primary function of principal cells in the Cortical Collecting Tubule?

    <p>NaCl reabsorption</p> Signup and view all the answers

    What is the main functional difference between the Medullary Collecting Tubule and the Cortical Collecting Tubule?

    <p>Water and urea permeabilities</p> Signup and view all the answers

    What is the primary mechanism by which the collecting ducts determine final urine osmolality?

    <p>Water reabsorption</p> Signup and view all the answers

    What is the role of aquaporin-2 in the collecting ducts?

    <p>Regulation of water reabsorption</p> Signup and view all the answers

    In which part of the nephron does glucose reabsorption occur?

    <p>Proximal tubule</p> Signup and view all the answers

    What type of transport is involved in glucose reabsorption in the proximal tubule?

    <p>Secondary active transport</p> Signup and view all the answers

    What percentage of sodium is reabsorbed in the thick ascending limb of loop of Henle?

    <p>25%</p> Signup and view all the answers

    What percentage of sodium reabsorption occurs independently of its plasma level?

    <p>90%</p> Signup and view all the answers

    What is the primary mechanism of sodium reabsorption in the proximal tubule?

    <p>Na+/K+ ATPase pump</p> Signup and view all the answers

    What is the effect of increased cardiac output on sodium reabsorption in the proximal tubule?

    <p>It decreases sodium reabsorption</p> Signup and view all the answers

    What is the most important determinant of ECF volume?

    <p>The amount of sodium in the ECF</p> Signup and view all the answers

    What percentage of sodium is excreted in urine?

    <p>1%</p> Signup and view all the answers

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