What is the function of a non-rebreather mask's reservoir bag?

What is the function of a non-rebreather mask's reservoir bag?

• A. To Store Carbon Dioxide
• B. To Supply A Reservoir Of Oxygen That The Patient Breathes From, Increasing FiO2
• C. To Regulate Oxygen Flow
• D. To Filter Air

Answer: (B)

The reservoir bag in a non-rebreather mask exists to provide a reservoir of oxygen for the patient to breathe from, boosting the delivered FiO2. The bag fills with oxygen from the supply and stays connected to the mask. When you inhale, oxygen flows from the bag into your lungs, while exhaled gas exits through one-way valves so it doesn’t re-enter the bag. This design keeps the inspired gas highly oxygen-rich and minimizes dilution with room air. If the bag collapses or the flow is too low, ambient air can be drawn in, lowering the FiO2 delivered. That’s why maintaining an adequate flow (enough to keep the bag inflated) is essential. The other options don’t describe the bag’s function: it isn’t meant to store CO2, regulate flow, or filter air.

The reservoir bag in a non-rebreather mask exists to provide a reservoir of oxygen for the patient to breathe from, boosting the delivered FiO2. The bag fills with oxygen from the supply and stays connected to the mask. When you inhale, oxygen flows from the bag into your lungs, while exhaled gas exits through one-way valves so it doesn’t re-enter the bag. This design keeps the inspired gas highly oxygen-rich and minimizes dilution with room air. If the bag collapses or the flow is too low, ambient air can be drawn in, lowering the FiO2 delivered. That’s why maintaining an adequate flow (enough to keep the bag inflated) is essential. The other options don’t describe the bag’s function: it isn’t meant to store CO2, regulate flow, or filter air.