Some key words

In hot conditions, blood vessels in the skin dilate, allowing more blood to flow through the skin capillaries. This means that more heat is lost from the surface of the skin by radiation. This is called vasodilation.

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Blood temperature is monitered by a centre in your brain called the hypothalamus

Hypothermia occurs when your bpody is exposed to low temperatures for a long period of time. The common cause of hypothermia is when your core body temperature falls below 35 degrees.

Symptoms:

- grey skin colour                             -cold skin

-amnesia (memory loss)

-shivering

- slurred speech

- confusion

- loss of coordination

Heat stroke is uncontrolled increase in your body temperature. Increase sweating due to very hot temperatures can lead to dehydration.  Dehydration stops sweating occuring which leads to the core body temperature increasing even further.