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oxygen is respiratory gas. it is required for respiration and oxidation of foodstuff. it is required for the survival of brain and other vital organs.oxygen help in the production of ATP during TCA cycle through ETC. Oxygen in cells occurs with carbon and hydrogen in most organic compounds that have either structural or metabolic functions. oxygen maintain homeostasis at the level of reaction of oxidation and reduction. It is important for such significant biological processes as DNA synthesis, enzymes activation, cellular cycle regulation, gene transcription activation, and apoptosis. it is also importance for oxygen carriers in living organisms, e.g., hemoglobin, mioglobin and the toxicity of oxygen and ozone.

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