In a patient who loses bicarbonate from the body, how does it get replaced?
A) The renal tubules secrete new bicarbonate into the urine.
B) The juxtaglomerular cells secrete new bicarbonate into the blood.
C) The juxtaglomerular cells generate new bicarbonate.
D) Renal tubular cells generate new bicarbonate.
Ans: D
Feedback: To replace any lost bicarbonate, the renal tubular cells generate new bicarbonate through a variety of chemical reactions. This newly generated bicarbonate is then reabsorbed by the tubules and returned to the body. This makes options A, B, and C incorrect.
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