Reaction of the body during exposure to heat

When external temperature is 32°C or above the non-evaporative,heat loss stops,even the body gain heat from the atmosphere.Now,the only way of heat loss is evaporation.
The reaction of the body: The body tries to decrease the heat gain by non-evapotrative mech,when the temperature is above 32°C,in addition to decrease heat gain,sweat secretion starts.

Decreased heat gain:
1.Vasodilatation of skin vessels (maximum dilatation at 32°C):
-by decreasing the symptom impulses,the blood flow to the skin increases.
-the temperature of skin rises and the non-evaporative heat loss may increase if the external temperature is below the skin temperature.
-the temperature of skin rises and the evaporative heat loss may increase if the xternal temperature is below the skin temperature.
2.Decreased heat production: The heat production is decreased to the basal level (apathy and anorexia).

Increased heat loss: This starts when the external temperature is above 32 °C.

Read More:
The Quantity and Role of Water in the body