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Area of Science:

  • Comparative physiology
  • Metabolic scaling
  • Mammalian biology

Background:

  • Mammalian mass-specific metabolic rates are crucial for understanding energy budgets.
  • The metabolic contribution of the bone organ has been largely overlooked in comparative research.
  • Existing research lacks comprehensive data on bone organ metabolic scaling.

Purpose of the Study:

  • To infer and analyze the mass-specific metabolic rate of the mammalian bone organ.
  • To investigate the scaling relationships of organ metabolic rates with body mass.
  • To compare the metabolic scaling of the bone organ with other major mammalian organs.

Main Methods:

  • Compiled literature data for mass-specific metabolic rates of major mammalian organs (excluding bone).
  • Inferred bone organ metabolic rates by subtracting known organ rates from total body metabolic rates.
  • Analyzed scaling relationships between whole-organ metabolic rate, mass-specific metabolic rate, and body mass.

Main Results:

  • The bone organ exhibits supra-¾ power scaling, indicating higher energy expenditure with increasing body size.
  • Lung and adipose depot also show supra-¾ power scaling, suggesting shared regulatory roles in metabolism.
  • The mass-specific metabolic rate of the heart was found to be independent of body mass.

Conclusions:

  • The bone organ demonstrates a significant and size-dependent energetic cost, contrary to previous assumptions.
  • Bone marrow and medullary adipocyte stores are likely key contributors to the bone organ's high energy expenditure.
  • The similar metabolic scaling of bone and adipose tissue suggests co-evolved roles in regulating whole-body metabolism.