What characterizes heat exhaustion?

Heat exhaustion is characterized by a serious disturbance of blood flow to vital organs. This condition typically arises from prolonged exposure to high temperatures, which can lead to dehydration and an imbalance in the body's fluid and salt levels. As the body works to regulate its temperature, the heat can cause blood vessels to dilate, resulting in a reduced amount of blood flow to the vital organs.

Maintaining normal blood circulation is crucial during heat exposure; if blood flow is compromised, the body struggles to deliver enough oxygen and nutrients, which can lead to more severe complications. Though the body may sweat excessively as a response to elevated temperatures, the effectiveness of this response diminishes as dehydration progresses, further impacting blood flow and organ function.

In contrast, maintaining normal body temperature does not characterize heat exhaustion, as the body may still be fighting to regulate this. Additionally, while sweating is a natural response to heat, it does not cease in cases of heat exhaustion; however, it can decrease if dehydration becomes severe. Finally, though high humidity often exacerbates the risk of heat exhaustion, the condition is not limited solely to high humidity environments; it can occur in a variety of climates, particularly when activities increase body heat.