12 Questions
Which of the following processes involves the movement of a substance against its electrochemical gradient?
Active transport
In the proximal tubule, the Na+ - H+ antiporter is located in which membrane of the cell?
Apical membrane
What drives the uphill movement of H+ during the Na+ - H+ antiport process?
The electrochemical gradient of Na+
Which of the following is an example of an active transport mechanism that consumes ATP?
Na+ - K+ - ATPase
What is the primary function of the Ca++ - ATPase?
Movement of Ca++ from the cell cytoplasm into the blood
Which of the following processes is important for the reabsorption of small proteins and macromolecules by the proximal tubule?
Endocytosis
During the Na+ - H+ antiporter process in the proximal tubule, what is the direction of movement for H+?
Out of the cell into the tubular lumen
Which of the following transport mechanisms in the collecting duct is responsible for H+ secretion?
H+ - K+ - ATPase
In active transport, which direction does the movement of substances typically occur?
From an area of lower to an area of higher concentration
What is the primary energy source for active transport processes like the Na+ - K+ - ATPase?
ATP
Which type of transport mechanism involves the movement of substances across the plasma membrane by forming vesicles in the cytoplasm?
Endocytosis
What is the role of ATP-binding cassette (ABC) transporters in cellular transport processes?
Transport of cholesterol and bile acids
This quiz covers the mechanism of Na+ - H+ antiporter in the proximal tubule of the kidney, where Na+ reabsorption and H+ secretion occur. Learn about the movement of ions against their electrochemical gradients and the role of this antiporter in maintaining fluid and electrolyte balance.
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