Anesthesia Knowledge Test 24 (AKT-24) Practice

In the human body, carbon dioxide (CO2) is transported in three main forms: dissolved in plasma, as bicarbonate ions (HCO3-), and bound to hemoglobin. Typically, about 7% of carbon dioxide is present in the dissolved form in the blood. This dissolved carbon dioxide is critical in maintaining acid-base balance and plays a key role in the regulation of respiration. While the majority of carbon dioxide is carried as bicarbonate ions (around 70%), the relatively small percentage that is dissolved is still important for physiological processes, such as affecting the pH of blood and helping to drive the respiratory drive through chemoreceptor stimulation. The other percentages reflect the other forms of carbon dioxide transport, not the dissolved form. Thus, recognizing that approximately 7% of carbon dioxide remains dissolved underscores its significance in maintaining adequate respiratory function and the acid-base homeostasis within the body.