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Related Concept Videos

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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Cognitive Development During Adulthood01:30

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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
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Related Experiment Video

Updated: Aug 14, 2025

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
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Is aging "normal"?

Chloe Johnson1, Warren Ladiges1

  • 1Department of Comparative Medicine, School of Medicine, University of Washington, Seattle, WA 98195, USA.

Aging Pathobiology and Therapeutics
|January 16, 2023
PubMed
Summary
This summary is machine-generated.

The term "normal" aging is scientifically inaccurate due to molecular and geropathological changes. "Resilient" aging better describes individuals who resist age-related changes, guiding research toward resilience mechanisms.

Keywords:
Agingage-related changesgeropathologyresilient aging“Normal” aging

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Area of Science:

  • Gerontology
  • Molecular Biology
  • Epigenetics

Background:

  • The term "normal" aging is frequently used in scientific literature.
  • This term implies common age-related changes without overt disease.
  • However, significant molecular and geropathological changes challenge this notion.

Purpose of the Study:

  • To critically evaluate the scientific accuracy of the term "normal" aging.
  • To propose a more accurate descriptor for aging processes.
  • To shift research focus towards mechanisms of resilience.

Main Methods:

  • Literature review and conceptual analysis of aging terminology.
  • Examination of molecular and epigenetic drivers of aging.
  • Comparative analysis of aging trajectories in different individuals.

Main Results:

  • The term "normal" aging is scientifically incorrect due to inherent molecular and geropathological alterations.
  • Aging is driven by changes in genetic and epigenetic processes.
  • Individual resilience to these changes varies significantly.

Conclusions:

  • The term "normal" aging is misleading and should be abandoned.
  • "Resilient" aging is a more accurate and scientifically sound descriptor.
  • Research should prioritize investigating mechanisms and therapeutic targets for resilience.