11 Questions
What determines the Na+ concentration in the body?
Both the amount of Na+ and water present
What can cause an increased Na+ concentration with a normal Na+ content?
Decreased water content
What is the key element in proximal tubule reabsorption?
The Na+-K+-ATPase pump in the basolateral membrane
What is the approximate amount of Na+ reabsorbed by the renal tubules per day?
25,000 mEq/day
What percentage of filtered water, Na+, Cl-, and K+ is reabsorbed by the proximal tubule?
67%
What is reabsorbed by the proximal tubule in addition to water, Na+, Cl-, and K+?
Glucose and amino acids
How is Na+ reabsorbed in the first half of the proximal tubule?
Together with HCO−3 and other solutes
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
Which process results in sodium bicarbonate (NaHCO−3) reabsorption?
H+ excretion
What is one of the specific transport proteins that mediate Na+ entry into the cell across the apical membrane?
Na+ - K+ - ATPase pump
How is Na+ uptake into the cell coupled in the first half of the proximal tubule?
With H+ or organic solutes
This quiz explores the distinction between the Na+ content and concentration in the body, highlighting how changes in water volume can impact Na+ concentration regardless of Na+ content. Learn how an individual can have varying Na+ levels while maintaining different water volumes.
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