• Catalyst: a substance that increases the speed of a chemical reaction.
• Cell signaling: communication system between the body cells necessary to allowing cells to communicate and respond to changes in the environment to maintain health.
• DNA: substance that contains the genic information.
• Enzyme: a substance that has the function of catalyst in a biological process.
• Free radicals: molecule highly reactive. Some Reactive Oxygen Species are free radicals.
• Gene: the fundamental unit of a living being. It is a sequence of molecules that constitutes the DNA and that contains the characteristics of the living being.
• Ischemia: total or partial reduction of blood flow in an organ.
• Metabolism oxygen: process by which the body uses oxygen to produce energy.
• Reactive Oxygen Species: chemical substances formed as byproducts of the metabolism oxygen.

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