Following several days in an acidotic state, a hospital patient has returned to desired pH. Which of the following processes could have contributed to the resolution of the patient's health problem?
A)
Exchange of Na+ and H+ ions
B)
Selective renal secretion and reabsorption of CO2
C)
The phosphate and ammonia buffer systems in the renal tubules
D)
Excretion of HCO3- by the kidneys
Ans:
C
Feedback:
The phosphate and ammonia buffer systems are secondary, but important, processes that contribute to the maintenance of appropriate pH. The kidneys must reabsorb nearly all the body's stores of HCO3- to maintain homeostasis, and they are not involved in CO2 control. Hydrogen-potassium exchange, not hydrogen-sodium exchange, is a component of acid-base control.
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