When the body is in a hot environment, or when too much body heat is produced by vigorous physical activity, the body will attempt to rid itself of the excess heat usually through sweating, the
evaporation of the sweat, and dilation of blood vessels. Dilation of blood vessels bring more blood to the skin surface.
People become ill when the body is exposed to more heat energy than one can handle and could result in heat illnesses. Elevated air temperatures and humidity, working around hot machinery, vigorous work activity, absence of a breeze or wind, and exposure to direct sunlight increase the risk of heat illness
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