What does not happen to a carbon dioxide molecule once it enters the bloodstream?

A) It is converted to a molecule of carbonic acid.
B) It binds to the protein portion of hemoglobin molecules within red blood cells.
C) It dissolves in plasma.
D) It is converted by carbonic anhydrase.
E) It binds to heme groups in hemoglobin.


Answer: E

Anatomy & Physiology

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