What else is carbon dioxide (CO₂) used for medically?

Carbon dioxide (CO₂) has several significant medical uses beyond its role in anesthesia and oxygen delivery. It is crucial for the regulation of pulmonary vascular pressures, which play a vital part in maintaining appropriate blood flow and oxygen exchange in the lungs. This regulation is essential during various medical procedures to ensure adequate organ perfusion.

In addition, CO₂ is commonly employed for insufflation, particularly during laparoscopic surgeries. By creating a space in the abdominal cavity, CO₂ allows surgeons to see more clearly and maneuver instruments with greater ease. This use is critical in minimally invasive surgical techniques, making procedures safer and more efficient.

Moreover, CO₂ is utilized for the calibration of medical equipment, such as gas analyzers, ensuring accurate readings that are vital for patient monitoring and safety. By incorporating CO₂ into diagnostic or monitoring systems, healthcare professionals can maintain the precision required for effective patient care.

These diverse applications highlight the importance of carbon dioxide in various medical settings, affirming choice C as the correct answer.