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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

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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

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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

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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 12, 2026

Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Aging as Problem and as Mystery.

David Barnard

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    |March 27, 2018
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    Summary
    This summary is machine-generated.

    This essay distinguishes between problems and mysteries in human experience, applying this framework to aging, dementia, and end-of-life care for the elderly. Understanding these realms offers new perspectives on complex issues in geriatric care.

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    Area of Science:

    • Gerontology
    • Philosophy of Medicine
    • Cognitive Science

    Background:

    • Human experience encompasses distinct realms of problems and mysteries.
    • These realms influence perception, interpretation, and response to life events, including aging.

    Purpose of the Study:

    • To elaborate on the distinction between problems and mysteries as frameworks for understanding.
    • To apply this problem/mystery distinction to key aspects of elderly care: aging, dementia, and dying.

    Main Methods:

    • Conceptual analysis of the problem/mystery dichotomy.
    • Application of the conceptual framework to case examples in geriatric care.

    Main Results:

    • Aging, dementia, and dying present unique challenges when viewed through the lens of problems versus mysteries.
    • A mystery-oriented approach may offer novel insights into managing complex elderly care situations.

    Conclusions:

    • The problem/mystery distinction provides a valuable heuristic for analyzing and addressing multifaceted issues in the care of the elderly.
    • Rethinking approaches to aging, dementia, and dying through this framework can enhance care strategies.