The secretion of organic anions------------------. is driven by the sodium gradient established by the apical membrane Na+ /K + pump is from the blood into the tubule cells in exchange for...

The secretion of organic anions------------------.

1. is driven by the sodium gradient established by the apical membrane Na+ /K + pump


2. is from the blood into the tubule cells in exchange for di/tricarboxylates.


3. they are removed across apical membrane via anions symporter


4. all of the above


5. None of the above