How does the partial pressure of oxygen influence oxygen toxicity?

The correct answer highlights the relationship between higher partial pressures of oxygen and the increased risk of oxygen toxicity. Oxygen toxicity occurs when an individual is exposed to oxygen levels that exceed safe thresholds for a given pressure. As the partial pressure of oxygen increases, especially above 1.4 ATA (atmospheres absolute), the body may begin to experience adverse effects due to heightened oxygen levels.

Under these elevated pressures, oxygen can produce toxic effects on the central nervous system and lungs, leading to symptoms such as visual disturbances, seizures, and lung damage. This risk is particularly pertinent in diving environments where divers might breathe gases enriched with oxygen, especially during deep dives or extended exposures that require greater caution.

Understanding this principle is crucial for divers using Enriched Air Nitrox, as it guides safe diving practices and helps in planning dives while minimizing the risk of oxygen toxicity by monitoring and managing the partial pressures of oxygen.