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Related Concept Videos

Body Temperature01:25

Body Temperature

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The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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Body Temperature01:07

Body Temperature

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Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
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Hypodermis01:02

Hypodermis

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The hypodermis (the subcutaneous layer or superficial fascia) is present directly below the dermis. It connects the skin to the underlying fascia (fibrous tissue) of the bones and muscles. It is not strictly a part of the skin, although the border between the hypodermis and dermis can be difficult to distinguish. The hypodermis consists of well-vascularized, loose, areolar connective tissue and adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for...
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Thermoregulation01:26

Thermoregulation

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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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.
Several factors influence...
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Fats as Energy Storage Molecules01:06

Fats as Energy Storage Molecules

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Updated: Mar 13, 2026

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans
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Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans

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Brown adipose tissue thermogenesis.

Denis P Blondin1,2

  • 1Department of Medicine, Division of neurology, Université de Sherbrooke, Sherbrooke, QC, Canada.

Physiology (Bethesda, Md.)
|March 12, 2026
PubMed
Summary
This summary is machine-generated.

Human brown adipose tissue (BAT) is a dynamic organ influencing metabolism and thermoregulation. Research explores its biomolecular features, activation strategies, and role in metabolic health, though uncertainties remain.

Keywords:
Brown adipose tissueadipose tissuesthermogenesisthermogenic adipocytesthermoregulation

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Area of Science:

  • Endocrinology and Metabolism
  • Adipose Tissue Biology
  • Thermogenesis Research

Background:

  • Human brown adipose tissue (BAT) is recognized for its role in thermoregulation and substrate metabolism.
  • Understanding BAT's function is crucial for addressing cardiometabolic health.
  • Recent research highlights BAT's dynamic nature and potential therapeutic implications.

Purpose of the Study:

  • To review current knowledge on human brown adipose tissue (BAT).
  • To synthesize information on BAT's biomolecular characteristics, activation methods, and functional significance.
  • To identify key areas of uncertainty in BAT research.

Main Methods:

  • Literature review synthesizing data on human BAT.
  • Analysis of molecular profiling studies on BAT adipocytes.
  • Examination of imaging techniques for measuring BAT function in vivo.
  • Review of physiological and pharmacological stimuli for BAT activation.

Main Results:

  • Human BAT features heterogeneous adipocytes with multilocular lipid droplets, rich innervation, vascularization, and mitochondria.
  • Cold exposure is a potent BAT activator, with nutritional and pharmacological stimuli also showing effects.
  • Imaging advances allow quantification of BAT thermogenesis, indicating a modest role in energy expenditure but association with reduced cardiometabolic risk.

Conclusions:

  • Human BAT plays a role in thermoregulation and substrate utilization, contributing to metabolic health.
  • Despite advances, significant uncertainties persist regarding BAT's thermogenic capacity and activation pathways.
  • Further integrated, multimodal research is needed to fully elucidate BAT's contribution to metabolic health.