What catalyzes the reaction that allows for the transport of 90% of CO2 in the blood?

The transport of carbon dioxide (CO2) in the blood is primarily facilitated through a biochemical reaction catalyzed by the enzyme carbonic anhydrase. This enzyme speeds up the reversible conversion of carbon dioxide and water into carbonic acid, which then dissociates into bicarbonate and hydrogen ions.

The majority of CO2 is carried in the bloodstream in the form of bicarbonate ions, which result from this reaction. The swift reaction facilitated by carbonic anhydrase is crucial because it helps maintain the acid-base balance in the blood and allows for efficient CO2 transport from tissues to the lungs, where it can be expelled during respiration. The high efficiency of this enzymatic reaction is essential for ensuring that CO2 is effectively transported, as approximately 90% of CO2 is in this bicarbonate form during systemic circulation.

The other options listed do not play a role in the transport of CO2 in the blood. Carbon monoxide dehydrogenase is involved in different metabolic pathways related to carbon monoxide; pyruvate kinase is an enzyme in glycolysis; and lactate dehydrogenase is responsible for converting pyruvate to lactate during anaerobic respiration. Thus, carbonic anhydrase is the key enzyme for facilitating the