Lewis's Medical Surgical Nursing in Canada, 5th Edition - Older Persons Related

Review Lewis's Medical Surgical Nursing in Canada, 5th Edition - Older Persons related questions and content

Findings from a health history indicate that the patient takes daily supplements of the antioxidants beta carotene, vitamin C, and vitamin E. This health practice reflects which of the following theories of biological aging?

  • A. Free radicals
  • B. Crosslinking
  • C. Somatic mutation
  • D. Telomere-telomerase depletion
Correct Answer: A

Rationale: Free radicals are natural by-products of many normal cellular processes and are also created under the influence of environmental factors such as smog, tobacco smoke, and radiation. Numerous natural protective mechanisms are in place to prevent oxidative damage. Recent research has focused on the roles of various antioxidants, including vitamins C and E, in slowing down the oxidative process and, ultimately, the aging process. The somatic mutation theory focuses on spontaneous mutations. The crosslinking theory is based upon lipids, proteins, CHO, and nucleic acid reactions. The telomere-telomerase depletion theory focuses on the loss of telomeres, repeated sequences at the ends of DNA.