Especies reactivas de oxígeno y antioxidantes: Aspectos básicos

Aerobic living systems use oxygen (O2) for energy production. However, O2 can become toxic due to the production of reactive species (ROS).
 ROS have complex cell signaling functions, but under an uncontrolled increase in their production, oxidative
 stress (OS) results, which cause damage cellular structures (lipids, proteins, nucleic acids). Faced with oxidative attack, must establish a rapid and efficient antioxidant response prevent or remove target molecule. Thus, cells possess system that allows them modulate levels achieve redox homeostasis. This article reviews discusses basic concepts regarding defenses.