A patient takes herbal and vitamin supplements in order to "slow down" the aging process. The nurse realizes that the patient believes in the use of antioxidants to slow down cell damage. Which is associated with the biological theory of aging?

1. Cross-link
2. Wear-and-tear
3. Free radical
4. Emerging biological


3. Free radical

Explanation: 1. The cross-link theory states that cross-linked proteins resulting from binding of glucose to proteins causes various problems associated with nutrition.
2. The wear-and-tear theory sees the human body as a machine and cellular function slows down with time.
3. The free-radical theory states that accumulated damage caused by oxygen radicals causes cells, and eventually organs, to lose function and organ reserve. The use of antioxidants and vitamins is believed to slow this damage.
4. The emerging biological theory states that there are specific genes responsible for human aging.

Nursing

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