Which component connects the fresh gas source to the patient in the circle breathing system?

• A. Inspiratory Limb
• B. Expiratory Limb
• C. CO2 Absorber
• D. Oxygen Flush Valve

Answer: (A)

In a circle breathing system, the fresh gas from the anesthesia machine is delivered to the patient through the inspiratory limb. This limb is the conduit that carries the inspired gas from the machine to the patient’s airway, allowing the fresh gas to reach the lungs during inspiration. Exhaled gas travels back through the expiratory limb, goes through the CO2 absorber to remove carbon dioxide, and then can be rebreathed after mixing with fresh gas in the circuit. The oxygen flush valve provides a high-flow burst of oxygen into the circuit but is not the standard path that delivers fresh gas to the patient. So, the inspiratory limb is the component that connects the fresh gas source to the patient.