Which of the following mechanisms operates in the nephron to maintain pH balance in the body?
- Bicarbonate ions from the tubule cells are secreted into the fi ltrate, then H + + HCO 3 − → H 2 CO 3 → CO 2 + H 2 O
- . In tubule cells CO 2 + H 2 O → H 2 CO 3 → H + + HCO 3 − then hydrogen ions are secreted into the fi ltrate
- . In tubule cells CO 2 + H 2 O → H 2 CO 3 → H + + HCO 3 − then hydrogen ions are transported into the peritubular capillaries
- In tubule cells CO 2 + H 2 O → H 2 CO 3 → H + + HCO 3 − then bicarbonate ions are secreted into the fi ltrate
Medicine
B: Carbon dioxide and water form hydronium and bicarbonate ions, the hydronium ions being secreted into the fi ltrate for excretion in urine.
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