The system switch on an anesthesia machine primarily controls what?

• A. Activation or shutdown of the gas delivery system
• B. Temperature monitoring
• C. Alarm settings
• D. Patient positioning

Answer: (A)

The primary function is that the system switch acts as the master control for the gas delivery system. When the switch is on, the gas sources (pipeline and/or cylinders) are connected to the machine and the gas path through regulators, flow meters, and vaporizers is enabled, allowing delivery to the breathing circuit and patient. When the switch is off, the entire gas delivery chain is isolated, preventing any gas from reaching the circuit. This safety control is distinct from other functions like temperature monitoring (part of the patient monitor), alarm settings (configured on separate panels), or patient positioning (not part of the machine’s gas system).