Final answer:
The blood becomes more acidic as CO2 levels rise and pH levels drop due to the increased production of hydrogen ions.
Step-by-step explanation:
As the CO2 level in the blood rises, the pH of the blood goes down, indicating that the blood is becoming more acidic. When CO2 levels increase in the blood, it reacts with water to form bicarbonate (HCO3−) and hydrogen ions (H+). The production of more H+ ions leads to a decrease in pH, indicating increased acidity. This process is part of the bicarbonate buffer system, which plays a crucial role in maintaining pH homeostasis in the blood. When the body is active, CO2levels rise and oxygen levels fall, leading to a lower pH. Conversely, when the body is at rest, CO2 levels are lower, and the pH is higher, indicating a more alkaline state.