How does the body respond to increased carbon dioxide levels in the blood?

The body's response to increased levels of carbon dioxide (CO2) in the blood primarily involves the respiratory system. When CO2 levels rise, it leads to a decrease in blood pH (making it more acidic), which is detected by chemoreceptors in the brain and arteries. In response to this condition, the body increases the respiratory rate and depth in an effort to expel the excess CO2 and improve gas exchange in the lungs. This increase in ventilation helps to restore normal levels of CO2 and maintain proper blood pH, ensuring that the body functions efficiently.

The other options do not accurately describe the body's physiological response to increased CO2. Reducing heart rate, lowering blood pressure, or restricting blood flow to the lungs would not effectively address the need to eliminate excess CO2 from the bloodstream. Instead, the body's strategy focuses on enhancing respiratory activity to manage elevated CO2 levels and promote homeostasis.