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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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Thermoregulation01:26

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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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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
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Lactating striped hamsters (Cricetulus barabensis) do not decrease the thermogenic capacity to cope with extreme cold

Wei Liu1, Sha-Sha Liao1, Meng-Huan Bao1

  • 1College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.

Zoology (Jena, Germany)
|August 11, 2024
PubMed
Summary
This summary is machine-generated.

Lactating female hamsters maintain their thermogenic capacity despite high energy demands. This ensures they can cope with cold environments during reproduction, similar to non-breeding animals.

Keywords:
body compositionbody massheat dissipationmetabolic thermogenesissmall mammals

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Area of Science:

  • Physiology
  • Animal Biology
  • Thermoregulation

Background:

  • Small mammals require high thermogenic capacity for activity in cold.
  • Lactating females may reduce brown adipose tissue (BAT) thermogenesis, but cold tolerance is unclear.

Purpose of the Study:

  • To investigate thermogenic capacity in lactating striped hamsters compared to non-breeding controls under acute cold stress (-15°C).

Main Methods:

  • Examined food intake, body temperature, locomotor behavior, resting metabolic rate, and non-shivering thermogenesis.
  • Assessed cytochrome c oxidase activity in liver, skeletal muscle, and BAT.
  • Measured serum thyroid hormone and BAT uncoupling protein 1 expression.

Main Results:

  • Lactating hamsters increased food intake and body temperature but decreased locomotor activity and BAT mass.
  • Despite these changes, lactating hamsters exhibited similar body temperature, resting metabolic rate, and non-shivering thermogenesis compared to controls.
  • Key indicators of thermogenic capacity, including enzyme activity and hormone levels, were comparable between groups post-cold exposure.

Conclusions:

  • Lactating female hamsters retain thermogenic capacity comparable to non-breeding individuals when exposed to extreme cold.
  • This preserved capacity is crucial for survival in cold environments during the energy-intensive reproductive period.