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

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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?

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

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

67% Signup and view all the answers

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

Glucose and amino acids Signup and view all the answers

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

Together with HCO−3 and other solutes Signup and view all the answers

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

Differences in the Na+ transport systems and tubular fluid composition Signup and view all the answers

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

H+ excretion 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?

Na+ - K+ - ATPase pump Signup and view all the answers

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

With H+ or organic solutes Signup and view all the answers