Which component allows manual ventilation by squeezing to deliver breaths?

Which component allows manual ventilation by squeezing to deliver breaths?

• A. Reservoir Bag
• B. Vaporizers
• C. Flowmeters
• D. O2 Flush Valve

Answer: (A)

Manual ventilation is achieved with the reservoir bag. This flexible bag attached to the breathing circuit acts as a gas reservoir; when you squeeze it, you push a measured volume of fresh gas into the patient’s lungs, delivering a breath through the circuit. The bag lets you control the tidal volume by how hard you squeeze and to observe chest rise, which helps confirm effective ventilation. It also provides a means to ventilate if the mechanical ventilator is paused or unavailable. The other components have different roles: vaporizers add anesthetic vapor to the gas, flowmeters regulate gas flow, and the oxygen flush valve delivers a high flow of oxygen directly to the circuit to purge or rapidly fill it, not for delivering controlled breaths.

Manual ventilation is achieved with the reservoir bag. This flexible bag attached to the breathing circuit acts as a gas reservoir; when you squeeze it, you push a measured volume of fresh gas into the patient’s lungs, delivering a breath through the circuit. The bag lets you control the tidal volume by how hard you squeeze and to observe chest rise, which helps confirm effective ventilation. It also provides a means to ventilate if the mechanical ventilator is paused or unavailable. The other components have different roles: vaporizers add anesthetic vapor to the gas, flowmeters regulate gas flow, and the oxygen flush valve delivers a high flow of oxygen directly to the circuit to purge or rapidly fill it, not for delivering controlled breaths.