7 Questions
What type of reabsorption occurs in the proximal tubule with respect to fluid and electrolytes?
Isotonic reabsorption
How is the transepithelial flux of sodium, water, and other solutes primarily facilitated in the proximal tubule?
Through gaps between the cells (the 'shunt' pathway)
Which water channels in the proximal tubule are not sensitive to hormonal regulation?
Aquaporin-1 (AQP-1)
What is the primary source of the intracellular H+ ions in the proximal tubule?
Carbonic acid from carbonic anhydrase
What is the primary function of aquaporin-1 (AQP-1) water channels in the proximal tubule?
Enabling isotonic reabsorption of fluid and electrolytes
What is the enzyme responsible for producing carbonic acid in the proximal tubule?
Carbonic anhydrase
How does the 'shunt' pathway primarily contribute to transepithelial flux in the proximal tubule?
By allowing passage of water through the cells
Test your knowledge on the mechanisms of fluid and electrolyte reabsorption in the proximal tubule of the kidney. Assess your understanding of processes such as carbonic acid conversion, sodium flux, and water reabsorption.
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