Vasodilation & Vasoconstriction
- Blood temp. monitored the hypothalamus in the brain.
- Hot conditions - blood vessels dilate, allowing more blood flow to the skin capillaries.
- Vasodilation - heat is lost from surface of skin by radiation.
- Cold conditions - blood vessels constrict, reducing blood that flows through skin capillaries.
- Vasoconstriction - Less heat lost from surface of skin by radiation.
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- Occurs when body is exposed to low temperatures for long periods of time.
- Body can't replace heat as fast as it's being lost.
- If untreated, can lead to death.
- Common cause, when core body temperature falls below 35 degrees celcius.
- Symptoms - grey skin colour, amnesia, shivering, slurred speech, confusion, loss of co-ordination, cold skin.
- Treatments - raising core body temperature, insulating body, drinking warm drinks.
- Should not rub/massage the skin because it brings blood to the surface, causes more heat to be lost.
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- Heat Stroke - uncontrolled increase in body temperature.
- Increased sweating due to very hot temperatures leads to dehydration.
- Dehydration - stops sweating from occuring, leads to core body temperature increasing further.
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