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Related Concept Videos

Metabolic Rate01:25

Metabolic Rate

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The human body is a powerhouse of energy, with every cell performing numerous functions that require energy. This energy production and consumption is measured by the metabolic rate, which quantifies the total heat generated by all the body's chemical reactions and mechanical work. This measurement helps to determine the rate of kilocalorie (kcal) consumption needed to fuel all ongoing activities.
The Basal Metabolic Rate (BMR) measures the energy expended at rest.
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Introduction to Metabolism01:30

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Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
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Regulation of Metabolism01:19

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
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Is metabolic rate a universal 'pacemaker' for biological processes?

Douglas S Glazier1

  • 1Department of Biology, Juniata College, Huntingdon, PA 16652, U.S.A.

Biological Reviews of the Cambridge Philosophical Society
|May 28, 2014
PubMed
Summary

Metabolic rate does not solely drive biological processes; energy and information, along with environmental factors, interact to regulate the pace of life. A comprehensive view requires understanding both energetic and informational control systems.

Keywords:
allometric scalingbiological regulationbody sizeenergyinformationmetabolic theoryontogenetic growthpace of lifesignallingtemperature

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Physiology

Background:

  • The "metabolic pacemaker" view posits that metabolic rate dictates the speed of biological, ecological, and evolutionary processes.
  • This theory, central to the "metabolic theory of ecology," is supported by correlational evidence but lacks direct mechanistic support.
  • Existing evidence shows dissociation between metabolic rate and other biological process rates due to various intrinsic and extrinsic factors.

Purpose of the Study:

  • To critically evaluate the limitations of the metabolic pacemaker view.
  • To propose a more comprehensive understanding of the "pace of life" that integrates energy and information.
  • To highlight the role of regulatory systems and environmental interactions in coordinating biological processes.

Main Methods:

  • Literature review and synthesis of existing evidence.
  • Analysis of theoretical frameworks in ecology and biology.
  • Examination of empirical data on metabolic rate, growth, development, and other biological processes.

Main Results:

  • The metabolic pacemaker view is limited by indirect evidence and contradicted by numerous examples where metabolic rate is dissociated from, or responds to, other biological processes.
  • Factors like hormonal action and environmental changes can decouple metabolic rate from process rates.
  • Metabolic rate is often coadjusted with other processes, not solely driving them, indicating a more complex interplay.

Conclusions:

  • A comprehensive understanding of the pace of life requires considering both energy and information control, and their environmentally sensitive interactions.
  • Biological signaling pathways and regulatory systems play a crucial role in coordinating metabolic and other biological processes.
  • Further research is needed to understand the temporal integration and coordination of biological processes within the pace of life.