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Related Concept Videos

Body Temperature01:25

Body Temperature

1.1K
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...
1.1K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
377
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.2K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.4K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

158
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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Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management
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Heat and the Heart.

Yash Desai1, Haitham Khraishah2, Barrak Alahmad3,4,5

  • 1Department of Internal Medicine, University of Maryland School of Medicine, Baltimore, MD, USA.

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Extreme heat significantly impacts heart health, worsening cardiovascular diseases like heart attack and stroke. More research is crucial to understand heat

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Area of Science:

  • Cardiology
  • Environmental Health
  • Public Health

Background:

  • Cardiovascular disease is the leading global cause of mortality.
  • Extreme heat poses significant risks to cardiovascular health, particularly for individuals with pre-existing conditions.

Purpose of the Study:

  • To review the relationship between heat exposure and major cardiovascular diseases.
  • To explore the physiological mechanisms underlying heat's adverse effects on the heart.

Main Methods:

  • Literature review of epidemiological studies.
  • Analysis of physiological responses to high temperatures.

Main Results:

  • Heat exposure is linked to increased risks of ischemic heart disease, stroke, heart failure, and arrhythmia.
  • Physiological responses to heat include dehydration, increased metabolic demand, hypercoagulability, electrolyte imbalances, and systemic inflammation, straining the heart.

Conclusions:

  • Understanding the mechanisms linking heat and cardiovascular disease requires further research.
  • Clinical guidelines are needed to manage cardiovascular conditions during heat events, emphasizing the role of healthcare professionals in addressing climate change impacts on health.