What gas causes oxygen toxicity at high partial pressures?

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Multiple Choice

What gas causes oxygen toxicity at high partial pressures?

Explanation:
Oxygen toxicity happens when the partial pressure of oxygen becomes high enough to damage body tissues. This is specific to oxygen itself—the higher the inspired oxygen partial pressure (PIO2), the greater the risk. In diving terms, breathing oxygen-rich gas at depth increases PIO2, which can lead to CNS symptoms like seizures or pulmonary effects with longer exposure. The other gases (nitrogen, helium, argon) do not cause oxygen toxicity; they can cause other issues (like nitrogen narcosis) but not toxicity from oxygen.

Oxygen toxicity happens when the partial pressure of oxygen becomes high enough to damage body tissues. This is specific to oxygen itself—the higher the inspired oxygen partial pressure (PIO2), the greater the risk. In diving terms, breathing oxygen-rich gas at depth increases PIO2, which can lead to CNS symptoms like seizures or pulmonary effects with longer exposure. The other gases (nitrogen, helium, argon) do not cause oxygen toxicity; they can cause other issues (like nitrogen narcosis) but not toxicity from oxygen.

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