Carbon dioxide is carried in the plasma a. in combination...

Carbon dioxide is carried in the plasma
a. in combination with hemoglobin.
b. as the bicarbonate ion.
c. combined with carbonic anhydrase.
d. only as a part of interstitial fluid.
e. All of these are correct.

Key Concepts

Carbon Dioxide Transport in Blood

This concept encompasses the various mechanisms by which carbon dioxide is carried from body tissues to the lungs. It includes dissolved CO2 in plasma, conversion into bicarbonate ions through a chemical reaction, and binding to proteins such as hemoglobin in red blood cells. Understanding this transport is crucial for comprehending respiratory gas exchange and acid–base balance in the body.

Bicarbonate Ion

Bicarbonate is the primary form in which carbon dioxide is transported in the blood plasma. CO2 reacts with water, a reaction catalyzed by carbonic anhydrase, to form carbonic acid, which then quickly dissociates into bicarbonate and hydrogen ions. This process is essential for maintaining blood pH and efficient gas exchange.

Carbonic Anhydrase

This enzyme accelerates the conversion of carbon dioxide and water into carbonic acid, facilitating its subsequent dissociation into bicarbonate and hydrogen ions. Its activity is fundamental in the rapid response required for transporting CO2 and regulating acid–base balance within the blood.

Blood Plasma

Blood plasma is the liquid component of blood that serves as a medium for the transport of various substances, including dissolved gases and ions. It plays a critical role in carrying bicarbonate, the main form in which carbon dioxide is transported, thereby contributing to the body’s homeostatic regulation during the gas exchange process.

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