Energy gain and loss must be balanced in order to maintain a constant body brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high.

Body extremities tend to be brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high than the core body temperature, energy is transferred from the blood to the tissues when blood reaches cooler parts.

Temperature receptors in the brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high detect external temperature.

Temperature receptors in the brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high (hypothalamus) detect the temperature of the blood.

The brain (brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high) acts as a processing centre, receiving information from the temperature receptors, and triggering the effectors automatically.

brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high include sweat glands and muscles.

At high body temperatures , more brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high is produced by sweat glands which cools the body when it brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high and blood vessels supplying the capillaries of the skin brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high (vasodilation) allowing more blood to flow through skin capillaries which increases energy loss.

brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high is an uncontrolled increase in body temperature.

A common cause of heat stroke is brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high exercise when it is warm. Symptoms include headache, dizziness and an inability to concentrate. Initial treatment of heat stroke is to cool the body e.g. by spraying the skin with water.

Exposure to very hot temperatures produces increased sweating, and can produce brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high, which may lead to reduced sweating and further increase of core body temperature.

When core body temperature becomes brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high the normal mechanisms for controlling body temperature break down.

At low body temperatures the increased rate of respiration stimulated when muscles contract rapidly (brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high) results in some of the energy transferred in respiration warming the surrounding tissues.

Blood vessels supplying the capillaries of the skin brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high (vasoconstriction) restricting blood flow through skin capillaries which reduces energy loss.

brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high is when core body temperature falls below 35C.

Symptoms of hypothermia are brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high, poor coordination and poor judgment.

In hypothermia, body heat cannot be replaced as fast as it is being brainconstrictcoolerdehydrationdilatedrowsinessEffectorsevaporatesHeat strokehypothalamusHypothermialostshiveringskinstrenuoussweattemperaturetoo high.