Which component carries exhaled gas away toward the scavenging system in the breathing circuit?

• A. Inspiratory Limb
• B. Expiratory Limb
• C. Reservoir Bag
• D. Oxygen Flush Valve

Answer: (B)

The gas that a patient exhales is directed through the expiratory limb. This limb serves as the route for waste gas to move away from the patient and toward the scavenging system, often passing through the circuit’s safety valves and toward the common gas outlet. The inspiratory limb is the pathway for fresh gas to reach the patient, not for venting exhaled gas. The reservoir bag stores gas for ventilation and doesn’t carry waste gas away to scavenging, and the oxygen flush valve introduces high-flow oxygen into the circuit rather than directing exhaled gas to the scavenger.