Understanding the Relationship between Na+ Content and Concentration in the Body
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Questions and Answers

What determines the Na+ concentration in the body?

  • The amount of Na+ present
  • Neither the amount of Na+ nor water present
  • The amount of water present
  • Both the amount of Na+ and water present (correct)

    • What can cause an increased Na+ concentration with a normal Na+ content?

  • Decreased water content (correct)
  • Increased water content
  • Increased Na+ content
  • Decreased Na+ content

    • What is the key element in proximal tubule reabsorption?

  • The reabsorption of all filtered solutes
  • The reabsorption of glucose and amino acids
  • The Na+-K+-ATPase pump in the basolateral membrane (correct)
  • The reabsorption of water, Na+, Cl-, and K+

    • What is the approximate amount of Na+ reabsorbed by the renal tubules per day?

    <p>25,000 mEq/day</p> Signup and view all the answers

    What percentage of filtered water, Na+, Cl-, and K+ is reabsorbed by the proximal tubule?

    <p>67%</p> Signup and view all the answers

    What is reabsorbed by the proximal tubule in addition to water, Na+, Cl-, and K+?

    <p>Glucose and amino acids</p> Signup and view all the answers

    How is Na+ reabsorbed in the first half of the proximal tubule?

    <p>Together with HCO−3 and other solutes</p> Signup and view all the answers

    What mediates the disparity in Na+ reabsorption in the two halves of the proximal tubule?

    <p>Differences in the Na+ transport systems and tubular fluid composition</p> Signup and view all the answers

    Which process results in sodium bicarbonate (NaHCO−3) reabsorption?

    <p>H+ excretion</p> Signup and view all the answers

    What is one of the specific transport proteins that mediate Na+ entry into the cell across the apical membrane?

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

    How is Na+ uptake into the cell coupled in the first half of the proximal tubule?

    <p>With H+ or organic solutes</p> Signup and view all the answers

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