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Related Concept Videos

Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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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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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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Body Temperature01:25

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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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Increased Body Temperature01:25

Increased Body Temperature

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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Requirements for Human Life01:26

Requirements for Human Life

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The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
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Related Experiment Video

Updated: Oct 9, 2025

Thermal Imaging to Study Stress Non-invasively in Unrestrained Birds
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HAEMATOTHERMIA: WARM-BLOODED AMNIOTES.

Brian G Gardiner1

  • 1Division of Life Sciences, King's College London, Campden Hill Road, London W8 7AH, U.K.

Cladistics : the International Journal of the Willi Hennig Society
|December 21, 2021
PubMed
Summary

Mammals and birds are sister groups, supported by new phylogenetic analysis and other evidence. This challenges the traditional view of "synapsid" fossils in amniote phylogeny, suggesting a different evolutionary path.

Area of Science:

  • Evolutionary Biology
  • Paleontology
  • Systematics

Background:

  • Amniote phylogeny is crucial for understanding vertebrate evolution.
  • The relationship between mammals, birds, and other amniotes has been debated.
  • The role of fossil groups, particularly

Purpose of the Study:

  • To reconstruct amniote phylogeny using an exhaustive parsimony analysis.
  • To test the hypothesis that mammals and birds are sister groups.
  • To re-evaluate the phylogenetic significance of

Main Methods:

  • Parsimony analysis of 97 characters.
  • Integration of parasitological and molecular data.
  • Phylogenetic analysis of fossil taxa, including pterosaurs,

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Related Experiment Videos

Last Updated: Oct 9, 2025

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Main Results:

  • Mammals and birds are confirmed as sister groups.
  • The monophyly of Mammalia within Amniota is not supported by the analysis.
  • Fossil groups like pterosaurs,

Conclusions:

  • The traditional view of amniote phylogeny, particularly the role of