Although much CO2 is carried in blood, yet blood does not become acidic, because

Explanation

All options are explained below: a)CO2 is continuously diffused through the tissues and is not allowed to accumulate:This statement is not entirely accurate. While CO2 is indeed continuously produced by tissues as a metabolic waste product, it is transported in the blood in various forms, primarily as bicarbonate ions and in dissolved form. The diffusion of CO2 through tissues is part of the process, but it doesn't prevent CO2 from temporarily accumulating in the blood. b) In CO2 transport, blood buffers play an important role (Correct Option):This statement is accurate. Blood contains buffer systems, such as the bicarbonate buffer system, that play a crucial role in maintaining blood pH and preventing excessive acidity. These buffer systems can neutralize excess H+ ions, including those generated from CO2. This process helps keep blood pH within a narrow and healthy range despite the presence of CO2.In short: Despite the presence of a significant amount of CO2 in the blood, blood does not become acidic because blood buffer systems, such as the bicarbonate buffer system, play an essential role in maintaining blood pH within a normal range. These buffers neutralize excess hydrogen ions (H+), which helps prevent excessive acidity. Option B correctly identifies the role of blood buffers in pH regulation. c)CO2 is absorbed by the leucocytes: This statement is not accurate. Leukocytes (white blood cells) have other functions in the immune system but are not primarily involved in CO2 absorption or transport in the blood. D) CO2 combines with water to form H2CO3, which is neutralized by NaCO3 This statement is not entirely accurate. CO2 combines with water to form carbonic acid (H2CO3), not H2CO3. This carbonic acid can dissociate into bicarbonate ions (HCO3-) and hydrogen ions (H+). Sodium bicarbonate (NaHCO3) is one of the blood's natural buffers that can help neutralize excess H+ ions. Correct Option: B. In CO2 transport, blood buffers play an important role. Summary: The statement in the question addresses the fact that, despite the presence of a significant amount of CO2 in the blood, the blood does not become acidic. This is primarily due to the role of blood buffer systems, such as the bicarbonate buffer system, which helps maintain blood pH within a normal range by neutralizing excess H+ ions. Option B correctly identifies the role of blood buffers in pH regulation, while the other options provide inaccurate explanations or functions related to CO2 and blood pH.