What is the role of the anesthesia machine's scavenging system?

• A. To collect and remove excess anesthetic gases to prevent occupational exposure.
• B. To circulate fresh gas to the OR.
• C. To heat the inhaled gas.
• D. To humidify the gas.

Answer: (C)

The scavenging system is there to protect people in the operating room by removing waste anesthetic gases from the breathing circuit. It captures the anesthetic vapor that is exhaled by the patient or otherwise vented from the circuit and directs it away from the patient area to a disposal exhaust, reducing occupational exposure for clinicians. It does not push fresh gas into the room, nor is it responsible for heating or humidifying the gas—that happens with the fresh gas supply and the humidification/heat-exchange components. In short, its job is to collect and remove excess anesthetic gases to keep the environment safer for staff.