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In a healthy individual, what is the normal range of carbon dioxide (CO2) levels in the blood?

  1. 25-30

  2. 30-35

  3. 35-45

  4. 45-55

The correct answer is: 35-45

The normal range of carbon dioxide (CO2) levels in the blood, typically measured as arterial blood gas (ABG) values, falls between 35 and 45 mmHg. This range indicates that the body is effectively maintaining homeostasis through adequate ventilation, which is essential for proper acid-base balance. When CO2 levels are within this normal range, it suggests that the respiratory system is functioning well, allowing for the efficient exchange of gases in the lungs. Levels below 35 mmHg can indicate hyperventilation, while levels above 45 mmHg can suggest hypoventilation or respiratory failure. Maintaining CO2 levels in the healthy range is critical, as deviations can lead to respiratory or metabolic complications, impacting overall health and function. Understanding this normal range is vital for healthcare providers to accurately assess respiratory function and intervene when necessary.