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Related Concept Videos

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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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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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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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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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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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.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
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Body Temperature Regulation in Hot Environments.

Jan-Åke Nilsson1, Mary Ngozi Molokwu2,3, Ola Olsson1

  • 1Department of Biology, Lund University, SE-223 62, Lund, Sweden.

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Wild birds in hot environments use hyperthermia, allowing body temperatures to rise significantly. This adaptation helps manage heat and water loss costs, crucial for survival in increasing ambient temperatures.

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Area of Science:

  • Zoology
  • Physiology
  • Environmental Science

Background:

  • Organisms in hot climates struggle to dissipate metabolic heat passively.
  • Evaporative cooling is energetically costly and leads to excessive water loss in birds.
  • Captive birds use controlled hyperthermia to mitigate heat stress.

Purpose of the Study:

  • To investigate the occurrence and extent of hyperthermia in wild birds during the hot and dry season.
  • To determine the relationship between ambient temperature and body temperature increase in wild birds.
  • To assess the adaptive significance of hyperthermia for wild bird survival in hot environments.

Main Methods:

  • Field study involving the capture of wild birds in central Nigeria during the hot and dry season.
  • Measurement of body temperatures in several bird species.
  • Correlation analysis between ambient temperatures and measured body temperatures.

Main Results:

  • Pronounced hyperthermia was observed in multiple wild bird species.
  • Some species exhibited body temperatures nearing predicted lethal levels.
  • Bird body temperature increased by 0.22°C for every 1°C rise in ambient temperature, up to a 5°C increase.

Conclusions:

  • Wild birds utilize hyperthermia as a strategy to cope with heat stress in hot environments.
  • This physiological flexibility allows birds to tolerate higher ambient temperatures, offsetting thermoregulatory costs.
  • Hyperthermia may be a vital adaptation for birds facing future increases in global ambient temperatures.