What is the function of the ERJ's oxygen system?

The function of the ERJ's oxygen system is to provide supplemental oxygen to crew and passengers in the event of cabin depressurization. In flight, the aircraft is typically pressurized to maintain a comfortable cabin environment for passengers and crew at high altitudes, where the outside air pressure is significantly lower. If there is a failure in the pressurization system or any other circumstance that leads to a loss of cabin pressure, the oxygen system is activated.

This system is essential for ensuring that crew members and passengers have the necessary oxygen to breathe properly until the aircraft can descend to a safer altitude where ambient air pressure is sufficient. The oxygen masks are designed to deploy automatically or manually and offer immediate access to supplemental oxygen to maintain safety during an emergency scenario.

The other options do not accurately represent the function of the oxygen system. Providing power backup for cockpit instruments relates more to electrical systems, cooling the cabin involves the environmental control system, and supporting the aircraft's pressurization systems is a function of different pressurization components rather than the oxygen system itself.