Why does urine frequently have an acidic pH?
A. The kidneys filter and excrete H+ from the blood.
B. The kidneys absorb H+ ions and excrete bicarbonate ions.
C. The kidneys produce H+ in the process of filtering the blood.
D. The blood has an acidic pH and the kidneys produce urine similar to the pH of the blood.
E. There is a high concentration of hydrochloric acid (HCl) in the urine, making it highly acidic.
Answer: A
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