Multiple choice

Which of the following statements is correct for acid base regulation in the body?

  1. A rise in the plasma level of bicarbonate ions lowers the pH of plasma.

  2. The pH of a buffer solution is always 7.0.

  3. Carbon dioxide directly raises the pH of body fluids.

  4. Overall human metabolism results in acid production.

  5. Buffers present in kidneys must be strong acids or bases.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide and bicarbonate ions are effectively a buffer pair.  If carbon dioxide is added to body fluids, the direct effect is the production of carbonic acid and thus a rise in the pH as some of this carbonic acid dissociates to produce free H+ ions.

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