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Related Concept Videos

Population Growth00:57

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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
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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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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 not...
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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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Related Experiment Video

Updated: Jul 18, 2026

Assessment of Age-related Changes in Cognitive Functions Using EmoCogMeter, a Novel Tablet-computer Based Approach
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Published on: February 14, 2014

Geographic perspectives on elderly population growth.

P A Rogerson

    Growth and Change
    |January 1, 1996
    PubMed
    Summary

    The elderly population proportion changes due to migration and the aging of existing residents. New elderly individuals entering the population from the non-mover group significantly impacts this demographic shift.

    Keywords:
    AdultAge FactorsAgedAmericasCohort AnalysisDemographic FactorsDeveloped CountriesGeographic FactorsMigrationNorth AmericaNorthern AmericaPopulationPopulation Characteristics--changesPopulation DynamicsResearch MethodologyTime FactorsUnited States

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    Area of Science:

    • Demography
    • Population Studies
    • Gerontology

    Background:

    • Regional population age structures are dynamic.
    • Factors influencing the elderly proportion include migration and internal cohort aging.

    Purpose of the Study:

    • To analyze the mechanisms driving changes in the elderly population proportion.
    • To empirically investigate elderly population growth in US states during the late 1980s.

    Main Methods:

    • Analysis of demographic changes over time.
    • State-level empirical study focusing on the late 1980s.

    Main Results:

    • Population aging is influenced by elderly in-migration and non-elderly out-migration.
    • The rate of individuals aging into the elderly cohort among nonmovers is a key factor.

    Conclusions:

    • Multiple demographic factors contribute to shifts in the elderly population share.
    • The spatial dynamics of aging nonmovers are critical for understanding regional elderly population growth.