Most carbon dioxide from cellular metabolism reaches the alveoli by being transported:
A) bound to hemoglobin.
B) as bicarbonate ion.
C) dissolved in plasma.
D) as carbonic anhydrase.

Question

Quizplus · Accepted Answer

Most carbon dioxide is transported in the blood as bicarbonate ion, which is formed by the reaction of carbon dioxide with water in red blood cells. This process is facilitated by the enzyme carbonic anhydrase.

Most Carbon Dioxide from Cellular Metabolism Reaches the Alveoli by Being