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Related Concept Videos

Thermoregulation01:26

Thermoregulation

2.1K
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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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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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

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Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Related Experiment Video

Updated: Dec 21, 2025

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

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Is Endothermy an Evolutionary By-Product?

Frank Seebacher1

  • 1School of Life and Environmental Sciences, Heydon-Laurence Building A08, University of Sydney, NSW 2006, Australia.

Trends in Ecology & Evolution
|May 13, 2020
PubMed
Summary
This summary is machine-generated.

Endothermy, the ability to regulate body temperature internally, is a byproduct of complex energy metabolism regulation. Its evolution is best understood through metabolic networks, not as a direct adaptation.

Keywords:
aetiologyenergy balanceheat productionmitochondriateleologyuncoupling

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Area of Science:

  • Physiology
  • Evolutionary Biology
  • Metabolic Regulation

Background:

  • Endothermy significantly impacts organism-environment energetic relationships and fundamental niches.
  • Internal body temperature regulation (endothermy) is intrinsically linked to energy metabolism.
  • Energy balance regulation is a fundamental biological process, increasing in complexity across taxa.

Purpose of the Study:

  • To re-evaluate the evolutionary origins of endothermy.
  • To propose a more parsimonious explanation for endothermy's evolution.
  • To contextualize endothermy within the framework of metabolic networks.

Main Methods:

  • Comparative analysis of metabolic regulation complexity across life forms.
  • Epistemological critique of adaptive arguments for endothermy.
  • Evolutionary interpretation through the lens of metabolic networks.

Main Results:

  • Increased complexity in metabolic networks correlates with a higher probability of endothermic phenotypes.
  • Adaptive explanations for endothermy are epistemologically problematic.
  • Endothermy is more parsimoniously viewed as a byproduct of energy balance regulation.

Conclusions:

  • Endothermy's evolution is best understood as an emergent property of increasingly complex metabolic regulation.
  • Viewing endothermy as a byproduct, rather than a direct adaptation, offers a more coherent evolutionary perspective.
  • Metabolic networks provide the essential context for understanding the evolution of endothermy.