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Related Concept Videos

Increased Body Temperature01:25

Increased Body Temperature

7.6K
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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Patterns of Fever01:26

Patterns of Fever

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Before understanding the types and patterns of fever, it is essential to know its phases.
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Types of Fever01:25

Types of Fever

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Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
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Methods of reducing fever01:22

Methods of reducing fever

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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
1.5K
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...
4.4K
Body Temperature01:25

Body Temperature

5.2K
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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Related Experiment Video

Updated: Mar 18, 2026

Determining Temperature Preference of Mosquitoes and Other Ectotherms
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Behavioral fever in ectothermic vertebrates.

Krzysztof Rakus1, Maygane Ronsmans2, Alain Vanderplasschen2

  • 1Department of Evolutionary Immunology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Krakow, Poland.

Developmental and Comparative Immunology
|July 7, 2016
PubMed
Summary

Fever is a conserved defense mechanism across vertebrates. This review explores mammalian fever mechanisms and compares them to behavioral fever in ectotherms, highlighting evolutionary links and adaptive value.

Keywords:
Behavioral feverEctothermsFeverInnate immunityProstaglandinsPyrogens

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Area of Science:

  • Comparative physiology
  • Evolutionary biology
  • Immunology

Background:

  • Fever is an evolutionarily conserved defense mechanism in vertebrates.
  • Endotherms exhibit physiological fever, while ectotherms display behavioral fever by seeking warmer environments.
  • Understanding fever mechanisms is crucial for comprehending innate immunity.

Purpose of the Study:

  • To review the mechanisms of fever induction in mammals.
  • To discuss conserved evolutionary mechanisms between mammalian and ectotherm fever.
  • To summarize evidence for the adaptive value of behavioral fever in ectotherms.

Main Methods:

  • Literature review of studies on mammalian fever.
  • Comparative analysis of fever mechanisms in endotherms and ectotherms.
  • Synthesis of experimental evidence on behavioral fever.

Main Results:

  • Mammalian fever involves complex signaling pathways.
  • Behavioral fever in ectotherms shares conserved pathways with mammalian fever.
  • Experimental data support the adaptive benefits of behavioral fever for ectotherm survival.

Conclusions:

  • Fever is a fundamental defense strategy with deep evolutionary roots.
  • Comparative studies reveal conserved mechanisms underlying fever across diverse vertebrate groups.
  • Behavioral fever in ectotherms is an adaptive trait with significant survival value.