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How Is Heat Removed From The Body
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Hypothalamus takes charge!
Ways heat can be transfered
Conditions of extreme heat can accelerate the increase in internal core temperature while exercising. This is followed by physiological, regulatory steps that act to return the body to a steady state and a safe temperature. Normal core temperatures are in the range of 36-38 degrees Celsius (96.8-.100.4 degrees Fahrenheit).
As the body cools
This will lead to fewer and fewer warning signals being sent to the hypothalamus which completes what is known as a "negative feedback loop."
So what happens next?
Vasodilation of the skin's arterioles occurs which improves the skin's ability to transfer heat through conduction and convection.
Sweat glands are opened in order to improve the skin's ability to transfer heat through evaporation. This is critical in environments of extreme heat!
The hypothalamus must then trigger physiological countermeasures using the sympathetic nervous system in order to help the body maintain a safe core temperature.
How is heat removed from the body?
Convection occurs when heat is transferred by moving air or water across the skin such as in aquatic exercise.
Radiation is the transfer of heat between two objects without physical contact and is the primary source of heat loss while at rest (60% of total).
Conduction involves the transfer of heat by the touching of two solid surfaces such as your skin and a brick wall you lean against.
Evaporation is the transfer of heat from a liquid to a gas such as your sweat evaporating from your skin into the air. This accounts for the most heat transferred (80% of total) during exercise.
And the process begins again!
The temperature of the blood and internal core will decrease if enough excess body heat is lost through any of the four possible means.
Impulses are received by the hypothalamus that warn of an increase in the temperature of the blood.