Question

Buffer systems present in blood help in maintaining the neutral pH of blood. Which is the most important buffer system present in blood?

A.Carbon monoxide-hydrogen buffer
B. Carbonic acid-bicarbonate buffer
C.Carbon dioxide-bicarbonate buffer

Answer 1

The most important buffer system in blood is the carbonic acid-bicarbonate buffer. This system controls blood pH by reacting carbon dioxide with water to form carbonic acid, which then dissociates into hydrogen and bicarbonate ions, regulating acid-base balance.

Step-by-step explanation:

The most important buffer system present in blood is the carbonic acid-bicarbonate buffer system. This system is crucial for maintaining the neutral pH of the blood, which is vital for our survival. In this system, the carbon dioxide (CO2) produced by metabolic processes in the cells dissolves in the blood and reacts with water to form carbonic acid (H2CO3). The carbonic acid then dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3-). The bicarbonate ions act as a base and can neutralize excess hydrogen ions in the blood, whereas the carbonic acid can neutralize excess hydroxide ions (OH-). This interaction helps to minimize changes in blood pH when acids or bases are added to the body.

Furthermore, the levels of carbonic acid are regulated by breathing, as it can be converted to carbon dioxide and exhaled, while bicarbonate levels are regulated by the kidneys. Together, these mechanisms work to maintain the blood pH within a very tight range, which is necessary for the proper functioning of our body's systems.

Answer 2

The correct answer is option B. The buffer system that is important to be present in the blood is the carbonic-bicarbonate buffer. It is essential because it is coupled with the respiratory system. It is the production of carbon dioxide that couple with this system.