Q:

Which of the following buffer systems of the body is affected by the action of the lungs?

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Which of the following buffer systems of the body is affected by the action of the lungs? 


  1. protein
  2. monohydrogen-phosphate/dihydrogen-phosphate
  3. ammonia/ammonium
  4. carbonic acid/bicarbonate

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D: Exhaled CO 2 comes from the disassociation of the carbonic acid molecule which in turn forms when a hydronium ion (acid) combines with a bicarbonate ion. Hence, exhaling CO 2 reduces the amount of acid in the blood.  

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