Lipid peroxidation as a cause of ageing and injury of cell is:(2001)
**Core Concept**
Lipid peroxidation is a process in which free radicals steal electrons from the lipids in cell membranes, resulting in the formation of peroxides. This can lead to cell damage and contribute to the aging process and various diseases.
**Why the Correct Answer is Right**
The correct answer involves the enzyme **superoxide dismutase**, which plays a crucial role in protecting cells from oxidative stress by converting superoxide radicals into hydrogen peroxide, which is then broken down by **catalase** into water and oxygen. However, when there is an imbalance between the production of free radicals and the body's ability to neutralize them, lipid peroxidation occurs. This can lead to cell damage, inflammation, and ultimately, contribute to the aging process.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the context of lipid peroxidation and cell aging.
**Option B:** This option might seem plausible, but it is not directly related to the mechanism of lipid peroxidation.
**Option C:** This option is incorrect because it does not accurately describe the process of lipid peroxidation and its role in cell aging.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that oxidative stress and lipid peroxidation play a significant role in various diseases, including atherosclerosis, cancer, and neurodegenerative disorders. Understanding the mechanisms of lipid peroxidation can help clinicians develop effective strategies for preventing and treating these conditions.
**Correct Answer: D. Free radicals.**