What is the main purpose of back-up oxygen cylinders in a medical oxygen system?

The primary function of back-up oxygen cylinders in a medical oxygen system is to provide an emergency oxygen supply. These cylinders serve as a contingency measure in case the main oxygen supply fails or is depleted. In a healthcare setting, where patients may rely on supplemental oxygen for respiratory support, having a reliable backup ensures uninterrupted care and safety. The presence of back-up cylinders is especially critical during power outages, equipment malfunctions, or supply disruptions, offering immediate access to life-saving oxygen.

The other options refer to functions that are not the primary role of these cylinders. Increasing the oxygen flow rate relates more to the design and function of other components in the system rather than the cylinders themselves. Regulating pressure levels is indeed important in gas delivery systems, but it is typically managed through regulators and not directly by the backup cylinders. Monitoring oxygen levels is essential but typically involves separate equipment, such as oxygen monitors or sensors, rather than the backup cylinders themselves.