What does the term "hypoxia" mean?

Hypoxia refers specifically to a deficiency in the amount of oxygen that reaches the body's tissues. This condition can occur at high altitudes where the air pressure decreases and, as a result, the oxygen available becomes insufficient for the body’s needs. When the body does not receive adequate oxygen, it can lead to various symptoms including confusion, fatigue, headache, and in severe cases, can impair judgment or even lead to unconsciousness.

Understanding hypoxia is critical for pilots, particularly because altitude can significantly impact oxygen levels. At higher elevations, the likelihood of experiencing hypoxia increases due to reduced atmospheric pressure, which may not provide enough oxygen for proper bodily function. Recognizing the signs of hypoxia and understanding its implications is essential for ensuring a safe flight.

In contrast, the other options describe different physiological changes or conditions that do not specifically relate to oxygen deficiency. Carbon dioxide excess in the blood pertains to a different respiratory issue, abnormal blood pressure can be caused by diverse factors unrelated to oxygen levels, and loss of coordination in limbs may be a symptom of hypoxia but is not defined as hypoxia itself.