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Related Concept Videos

Thermoregulation01:26

Thermoregulation

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,...
Body Temperature01:25

Body Temperature

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...
Body Temperature01:07

Body Temperature

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 (97–99°F), remaining relatively stable...
Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

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...
Thermosensation01:43

Thermosensation

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: Jun 8, 2026

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
06:57

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Published on: November 11, 2021

Adaptive thermogenesis in humans.

M Rosenbaum1, R L Leibel

  • 1Division of Molecular Genetics, Department of Pediatrics, Columbia University, College of Physicians and Surgeons, New York, NY, USA. mr475@columbia.edu

International Journal of Obesity (2005)
|October 12, 2010
PubMed
Summary
This summary is machine-generated.

Obesity results from gene-environment interactions. The body actively defends fat stores, making sustained weight loss challenging due to adaptive thermogenesis and hormonal signals like leptin.

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Related Experiment Videos

Last Updated: Jun 8, 2026

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
06:57

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Published on: November 11, 2021

Measuring Skeletal Muscle Thermogenesis in Mice and Rats
07:56

Measuring Skeletal Muscle Thermogenesis in Mice and Rats

Published on: July 27, 2022

Infrared Thermography for the Detection of Changes in Brown Adipose Tissue Activity
08:16

Infrared Thermography for the Detection of Changes in Brown Adipose Tissue Activity

Published on: September 28, 2022

Area of Science:

  • Physiology
  • Endocrinology
  • Neurobiology

Background:

  • Rising obesity rates stem from genetic predispositions interacting with modern environments favoring excess energy intake and sedentary behavior.
  • Weight loss is challenging, with over 80% of individuals regaining lost weight due to physiological defense mechanisms.

Purpose of the Study:

  • To explore the physiological mechanisms underlying the body's defense of fat stores.
  • To understand why sustained weight loss is difficult and how the body opposes weight maintenance.

Main Methods:

  • Review of metabolic, behavioral, neuroendocrine, and autonomic responses involved in energy balance.
  • Examination of the role of adaptive thermogenesis and hormones like leptin in weight regulation.

Main Results:

  • The body actively maintains a set point for fat storage through coordinated physiological responses.
  • Adaptive thermogenesis and hormonal signals, particularly leptin, oppose sustained weight loss.
  • Obesity is characterized by a robust defense of body energy stores.

Conclusions:

  • Obesity should be viewed as a chronic disease where the body actively resists weight loss.
  • Therapeutic strategies must account for the body's long-term opposition to maintaining reduced body weight.