The enzyme that speeds the combination of carbon dioxide and water inside red blood cells is

  • A. carbonic anhydrase
  • B. catalase
  • C. amylase
  • D. decarboxylase

Explanation

Carbonic anhydrase makes carbonic acid form rapidly, which then dissociates to bicarbonate and H+, the main vehicle for CO2 transport. Without the enzyme the reaction would be too slow for the transit time through a capillary.

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