Which of the following describes an antiport system on the basal side of renal tubule cells?
A. It transports CO2 from the blood into the tubule cells.
B. It transports bicarbonate from the tubular fluid back into the tubule cells.
C. It transports H+ in both directions across the epithelium.
D. It exchanges K+ for Na+.
E. It exchanges H+ for Na+.
Answer: D
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