Which of the following is a consequence of exceeding the recommended limits for oxygen exposure?

Exceeding the recommended limits for oxygen exposure can lead to serious consequences, one of which is the potential for seizures and other neurological effects. This phenomenon occurs because the body can become toxic to high levels of oxygen, particularly when subjected to pressures associated with diving. In environments with elevated oxygen levels, such as those found in deep diving or while using nitrox mixes with excess oxygen, the central nervous system can become hyperoxic. This hyperoxia can trigger various neurological symptoms, including visual disturbances, muscle twitching, and in severe cases, seizures.

Understanding the mechanism behind these effects is crucial for divers. Oxygen toxicity is particularly concerning at partial pressures above 1.4 ATA (atmospheres absolute), leading divers to follow strict guidelines to prevent exposure beyond safe limits. Monitoring oxygen levels in diving gas mixtures and adjusting dive profiles accordingly helps mitigate the risk of neurotoxic effects.

The other options, while they may sound beneficial, do not accurately reflect the reality of oxygen exposure and its consequences. Improved respiratory function, decreased risk of decompression sickness, and increased physical fitness are not outcomes associated with exceeding oxygen exposure limits; rather, they indicate situations benefiting from safe, controlled exposure to oxygen within recommended limits.