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Questions and Answers
What determines the Na+ concentration in the body?
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?
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?
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?
What is the approximate amount of Na+ reabsorbed by the renal tubules per day?
What percentage of filtered water, Na+, Cl-, and K+ is reabsorbed by the proximal tubule?
What percentage of filtered water, Na+, Cl-, and K+ is reabsorbed by the proximal tubule?
What is reabsorbed by the proximal tubule in addition to water, Na+, Cl-, and K+?
What is reabsorbed by the proximal tubule in addition to water, Na+, Cl-, and K+?
How is Na+ reabsorbed in the first half of the proximal tubule?
How is Na+ reabsorbed in the first half of the proximal tubule?
What mediates the disparity in Na+ reabsorption in the two halves of the proximal tubule?
What mediates the disparity in Na+ reabsorption in the two halves of the proximal tubule?
Which process results in sodium bicarbonate (NaHCO−3) reabsorption?
Which process results in sodium bicarbonate (NaHCO−3) reabsorption?
What is one of the specific transport proteins that mediate Na+ entry into the cell across the apical membrane?
What is one of the specific transport proteins that mediate Na+ entry into the cell across the apical membrane?
How is Na+ uptake into the cell coupled in the first half of the proximal tubule?
How is Na+ uptake into the cell coupled in the first half of the proximal tubule?
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