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Related Concept Videos

Homeostatic Imbalance01:10

Homeostatic Imbalance

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Homeostasis is the maintenance of a stable internal environment within the body, which is crucial for the proper functioning of cells, tissues, organs, and organ systems. The body has various control mechanisms that work together to regulate various physiological parameters such as temperature, blood pressure, pH balance, and fluid balance, to name a few. These control mechanisms are based on feedback loops that can be either positive or negative.
However, sometimes these feedback loops fail,...
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Positive and Negative Feedback Loops01:18

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Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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What is Homeostasis?01:16

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Maintaining homeostasis requires that the body continuously maintain its internal conditions. Each physiological condition has a particular set point, from body temperature to blood pressure to levels of certain nutrients. A set point is the physiological value around which the normal range fluctuates. A normal range is a restricted set of values that is optimally healthful and stable. For example, the set point for normal human body temperature is approximately 37°C (98.6°F).
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Disorders of the Autonomic Nervous System01:18

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Neural Regulation of Blood Pressure01:18

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The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
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Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

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Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Homeostatic dysregulation proceeds in parallel in multiple physiological systems.

Qing Li1, Shengrui Wang2, Emmanuel Milot1

  • 1Groupe de recherche PRIMUS, Department of Family Medicine, University of Sherbrooke, 3001 12e Ave N, Sherbrooke, Quebec, Canada, J1H 5N4.

Aging Cell
|September 30, 2015
PubMed
Summary

Multi-system physiological dysregulation is a key aging mechanism. This study shows distinct, interconnected system dysregulations that increase with age and predict health outcomes, providing evidence for aging processes.

Keywords:
agingbiomarkerhomeostasismulti-system dysregulationphysiologystatistical distance

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Area of Science:

  • Gerontology and Systems Biology
  • Biomarker Analysis and Health Outcomes

Background:

  • Aging is increasingly understood as multi-system physiological dysregulation.
  • Evidence for this biological mechanism of aging has been limited.

Purpose of the Study:

  • To test for the presence of multi-system dysregulation in aging.
  • To investigate the relationship between physiological system dysregulation and health outcomes.

Main Methods:

  • Analyzed biomarker data from nearly 33,000 individuals across four large datasets.
  • Grouped 37 biomarkers into six predefined physiological systems (lipids, immune, oxygen transport, liver function, vitamins, electrolytes).
  • Calculated system-specific dysregulation scores and assessed correlations between systems.

Main Results:

  • Correlations among a priori defined systems were weak but significant, indicating distinct dysregulation processes.
  • Dysregulation in most systems increased with age and predicted mortality, frailty, diabetes, heart disease, and chronic disease burden.
  • Arbitrary system groupings showed higher correlations, confirming the validity of predefined physiological systems.

Conclusions:

  • Provides the first unequivocal demonstration of integrated multi-system physiological dysregulation during aging.
  • Aging involves system-specific dysregulation processes, weakly linked, rather than a single global or completely independent process.
  • These system-specific dysregulations are implicated in the aging process and impact health outcomes.