Which statement best describes free radicals in tissue?

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Multiple Choice

Which statement best describes free radicals in tissue?

Free radicals in tissue are highly reactive and unstable because they carry unpaired electrons that make them readily react with nearby molecules to stabilize themselves. This reactivity drives damage to lipids, proteins, and DNA, contributing to oxidative stress. They’re typically short-lived, being quickly neutralized by antioxidants like superoxide dismutase, catalase, and glutathione peroxidase, as well as non-enzymatic antioxidants. They can be produced in several cellular locations—most notably mitochondria during respiration and by inflammatory cells—so they’re not confined to the nucleus. While some radicals (such as nitric oxide) can have signaling roles at controlled levels, the defining trait is their high reactivity and instability.

Free radicals in tissue are highly reactive and unstable because they carry unpaired electrons that make them readily react with nearby molecules to stabilize themselves. This reactivity drives damage to lipids, proteins, and DNA, contributing to oxidative stress. They’re typically short-lived, being quickly neutralized by antioxidants like superoxide dismutase, catalase, and glutathione peroxidase, as well as non-enzymatic antioxidants. They can be produced in several cellular locations—most notably mitochondria during respiration and by inflammatory cells—so they’re not confined to the nucleus. While some radicals (such as nitric oxide) can have signaling roles at controlled levels, the defining trait is their high reactivity and instability.

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