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相关概念视频

Decreased Body Temperature01:29

Decreased Body Temperature

602
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...
602
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,...
936
Body Temperature01:25

Body Temperature

928
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...
928
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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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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相关实验视频

Updated: Jun 17, 2025

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

Published on: November 11, 2021

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哺乳期的条纹仓鼠 (Cricetulus barabensis) 不会降低热能能力,以应对极端寒冷的温度.

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
概括
此摘要是机器生成的。

哺乳期雌性仓鼠尽管需要大量的能量,但仍保持其发热能力. 这确保它们可以在繁殖期间应对寒冷的环境,类似于非繁殖动物.

关键词:
身体构成 身体组成身体质量 身体质量散热散热热量的散发.代谢热生成的代谢热生成.小哺乳动物 小哺乳动物

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Last Updated: Jun 17, 2025

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
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Infrared Thermography for the Detection of Changes in Brown Adipose Tissue Activity
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科学领域:

  • 身体生理学 身体生理学
  • 动物生物学 动物生物学
  • 热调节 热调节 热调节

背景情况:

  • 小哺乳动物需要高的热生成能力来在寒冷环境中活动.
  • 哺乳期雌性可能会减少棕色脂肪组织 (BAT) 热生成,但寒冷耐受性尚不清楚.

研究的目的:

  • 在急性寒冷压力 (-15°C) 下,与非繁殖对照相比,对哺乳期的条纹子进行热生成能力的研究.

主要方法:

  • 检查了食物摄入量,体温,运动行为,休息代谢率和不发的热生成.
  • 在肝脏,骨肌肉和BAT中评估细胞染色体c氧化酶活性.
  • 测量了血清甲状腺激素和BAT脱蛋白1的表达.

主要成果:

  • 哺乳期仓鼠增加了食物摄入量和体温,但减少了运动活动和BAT质量.
  • 尽管有这些变化,哺乳 hamsters 呈现类似的体温,休息代谢率,和非的热生成与对照.
  • 热生成能力的关键指标,包括酶活性和激素水平,在寒冷暴露后的组之间是可比的.

结论:

  • 哺乳期雌性仓鼠在暴露于极度寒冷时,保留了与非繁殖个体相比的热能能力.
  • 这种保存的能力对于在能源密集的繁殖期在寒冷环境中生存至关重要.