During systemic gas exchange, what happens to carbon dioxide after it enters a red blood cell?
A. It reacts with carbonic acid to become bicarbonate.
B. It reacts with water to form carbonic acid.
C. It attaches to the heme portion of hemoglobin, forming carbaminohemoglobin.
D. It reacts with bicarbonate to become carbonic acid.
Answer: B
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Fill in the blank(s) with the appropriate word(s).