A long-standing increase in arterial PCO2 (respiratory acidosis) leads to an increase in

A. True This raises plasma bicarbonate to compensate for the raised PCO2 in respiratory acidosis.

B. True In acidosis, tubular cells excrete more to buffer the additional H+ ions being secreted.

C. True The increased secretion of H+ ions in exchange for Na+ results in decreased secretion of K+ ions.

D. False The ratio decreases as hydrogen ions are taken up by the phosphate buffer system.

E. False The urine remains bicarbonate-free.