What is the role of a reservoir bag in a continuous flow oxygen system for passengers?

The role of a reservoir bag in a continuous flow oxygen system is to collect oxygen for higher inspiratory flow rates. This is particularly important in situations where a passenger may require a quick intake of oxygen, such as during physical exertion or if they need a higher concentration of oxygen momentarily. The reservoir bag temporarily stores extra oxygen, allowing it to be delivered rapidly to the user when they inhale, ensuring that they receive the necessary amount of oxygen, particularly during heavier breathing.

In continuous flow systems, the flow of oxygen may not always match the immediate demand of the passenger, especially during periods of increased respiratory effort. The reservoir bag helps bridge this gap by accumulating oxygen that can be drawn upon when needed, enhancing the effectiveness of the oxygen delivery system.

The other options do address different aspects of oxygen systems but do not capture the primary function of the reservoir bag. For example, providing a consistent flow of oxygen is more characteristic of the system's general operation rather than the specific role of the bag. Similarly, while preventing a mask from falling off is an important feature of how a mask is fit onto the face, it is unrelated to the specific function of the reservoir bag in oxygen delivery. Lastly, while having a backup supply is a good practice in aviation safety