In the circle breathing system, which component is the inspiratory limb that delivers fresh gas from the source to the patient?

• A. The limb containing the CO2 absorber
• B. The Expiratory Limb of Circuit
• C. The Inspiratory Limb of Circuit
• D. The Reservoir Bag

Answer: (C)

In a circle breathing system, there are two main pathways for gas: the inspiratory limb and the expiratory limb. The inspiratory limb is the tube that carries fresh gas from the anesthesia machine’s source to the patient, delivering the prepared gas for the next breath as it moves toward the patient through the circuit. The expiratory limb, on the other hand, takes the gas the patient exhales away from the patient toward the CO2 absorber to remove CO2 and then back into the system for possible rebreathing. The reservoir bag serves as a gas reservoir and a manual ventilation aid, but it is not the pathway that delivers fresh gas. The limb that carries the CO2 absorber is involved in processing exhaled gas, not delivering fresh gas to the patient.