<prompt> Mechanism of oxygen toxicity is?Direct DNA damageApoptosisNuclear fragmentationFree radicals  <response>: ANSWER: D Free radicalsREF: Pulmonary physiology by Michael G. Levitzky page Page 245, Yao Artusios anesthesiology: problem-oriented patient management - Page 67The mechanism of oxygen toxicity is controversial but probably involves the formation of superoxide anions or other free radicalsThe biochemical basis for the toxicity of oxygen is the partial reduction of oxygen by one or two electrons to form reactive oxygen species 