Which of the following describes an antiport system on the basolateral side of r

Question

Which of the following describes an antiport system on the basolateral side of renal tubule cells?

Please explain why. I am really confused with this. I thought it was the bicarbonate, but now I'm not sure. Thank you.

Question options:

It exchanges K+ for Na+.

It transports bicarbonate from the tubular fluid back into the tubule cells.

It exchanges H+ for Na+.

It transports CO2 from the blood into the tubule cells.

It exchanges K+ for Na+.

It transports bicarbonate from the tubular fluid back into the tubule cells.

It exchanges H+ for Na+.

It transports CO2 from the blood into the tubule cells.

Explanation / Answer

the antiport system on the basolateral side of renal tubule is ; occur   in DCT DISTEL CONVOLUTED TUBULE

it exchanges the pottasium for Na + ions

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