Final answer:
The oxygen level low light activates at or below 200 psi, or when system pressure falls below 500 psi, indicating insufficient oxygen in the system, which can lead to hypoxemia and tissue hypoxia.
Step-by-step explanation:
The oxygen level low light is a critical safety feature in aircraft and medical oxygen systems. It indicates when the oxygen concentration in the system is insufficient for safe operation. The correct answer to the question is Option 1: the oxygen level low light comes on at or below 200 psi, or when system pressure is below 500 psi. This is significant because oxygen plays a critical role in maintaining bodily functions, and a drop in oxygen levels (hypoxemia) can lead to tissue hypoxia, which is inadequate oxygenation of tissues and can cause serious health risks.