Select the true statement regarding hypoxia.

Hypoxia refers to a deficiency in the amount of oxygen reaching the tissues, and its symptoms can indeed be very subtle and difficult to recognize, especially in flight. The environment in an aircraft, with changes in altitude and pressure, can exacerbate this subtlety. Pilots and passengers may experience mild symptoms like slight fatigue, difficulty concentrating, or irritation without realizing they are experiencing hypoxia. This can lead to dangerous situations if not recognized promptly.

In aviation, altitude affects the amount of oxygen available; therefore, awareness of these subtle signs is crucial for maintaining safety. It is essential for pilots to be educated on the potential symptoms of hypoxia, so they can recognize them quickly and take appropriate action.