Final answer:
Carboxyhemoglobin is not a method of carbon dioxide transport in blood. Carbon dioxide is carried as dissolved plasma, bicarbonate, and carbaminohemoglobin.
Step-by-step explanation:
The method that is not a way that carbon dioxide is transported in the blood is A. As carboxyhemoglobin. Carbon dioxide is transported in the blood through three primary methods:
- B. Dissolved in plasma,
- C. As bicarbonate,
- D. As carbaminohemoglobin.
A small portion of carbon dioxide is dissolved directly in the plasma. The largest amount is carried as bicarbonate, formed in erythrocytes with the help of carbonic anhydrase, which then dissociates into bicarbonate ions and hydrogen ions. About 10 percent is transported as carbaminohemoglobin, formed when carbon dioxide binds to hemoglobin within red blood cells.
The correct answer is A. As carboxyhemoglobin. Carboxyhemoglobin is actually a compound formed when carbon monoxide binds to hemoglobin in the blood. It is not a form of carbon dioxide transport. The other three options - dissolved in plasma, as bicarbonate, and as carbaminohemoglobin - are all ways that carbon dioxide is transported in the blood.