What occurs in a person's body when the amount of oxygen sharply decreases and the amount of carbon dioxide greatly increases?

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This scenario describes asphyxia, a state in which the body cannot get enough oxygen and carbon dioxide builds up because gas exchange is failing. When oxygen is suddenly low, cells can’t perform aerobic respiration, so energy production drops and waste products like CO2 accumulate in the blood. The combination of very little oxygen and high carbon dioxide overwhelms the body's ability to function, leading to dizziness, confusion, loss of consciousness, and potentially death if not reversed.

Anemia isn’t the right fit because it’s about reduced oxygen transport due to fewer or dysfunctional red blood cells, not a rapid failure to exchange gases. Hypothermia is a drop in body temperature, which affects metabolism differently. Shock is a broader failure of circulation that can occur with many causes, but the question specifies the gas-exchange problem of falling oxygen and rising carbon dioxide, which defines asphyxia.