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Related Concept Videos

Aging01:26

Aging

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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
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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The Effect of Aging on Tissues01:19

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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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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
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Related Experiment Video

Updated: Feb 15, 2026

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
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Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging

Published on: January 30, 2026

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Age is just a number.

Hiram Beltrán-Sánchez1, Caleb Finch2

  • 1Department of Community Health Sciences and California Center for Population Research, The University of California Los Angeles, Los Angeles, United States.

Elife
|January 25, 2018
PubMed
Summary
This summary is machine-generated.

Naked mole rats do not follow the Gompertz law of mortality. These rodents exhibit no age-related increase in mortality risk, defying typical aging patterns observed in most species.

Keywords:
GompertzH. glaberagingecologynaked mole-ratnegligible senescence

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Area of Science:

  • Gerontology
  • Comparative Biology
  • Zoology

Background:

  • The Gompertz law predicts an exponential increase in mortality with age.
  • Most species exhibit a clear age-related rise in mortality risk.
  • Understanding exceptions to aging laws can reveal biological mechanisms of longevity.

Purpose of the Study:

  • To investigate the mortality patterns of the naked mole rat (Heterocephalus glaber).
  • To determine if naked mole rats adhere to the Gompertz law of mortality.
  • To explore the biological basis for potential aging defiance in this species.

Main Methods:

  • Longitudinal tracking of mortality rates across a large population of captive naked mole rats.
  • Statistical analysis of survival data to assess age-specific mortality.
  • Comparison of observed mortality curves with Gompertzian predictions.

Main Results:

  • Naked mole rats demonstrated a lack of significant increase in mortality risk with advancing age.
  • The species' survival curve deviates markedly from the exponential increase predicted by the Gompertz law.
  • Mortality rates remained consistently low across the lifespan of the studied individuals.

Conclusions:

  • Naked mole rats represent a unique model for studying biological immortality.
  • The findings challenge universal applicability of the Gompertz law in aging.
  • Further research into naked mole rat physiology may uncover novel insights into aging processes and longevity.