What is one sign of hypoxia?

Blurred vision is a sign of hypoxia because it occurs when the brain and eyes do not receive sufficient oxygen. Hypoxia can affect various bodily systems, and one of the critical areas impacted is the visual system. The retina, which is responsible for converting light into signals that the brain can interpret as images, relies heavily on an adequate oxygen supply. When oxygen levels drop, the function of the retina may become impaired, leading to visual disturbances such as blurred vision.

In contrast, other signs such as increased appetite, increased energy, and excessive sweating do not correlate directly with hypoxia. Increased appetite and energy typically suggest a well-oxygenated state, while excessive sweating might be a response to other factors, such as heat or stress, rather than to insufficient oxygen levels. Thus, blurred vision stands out as a clear indicator of hypoxia's effects on human physiology.