Which part of the body is most affected by heat exhaustion?

Heat exhaustion primarily affects the overall body due to prolonged exposure to high temperatures and physical exertion, resulting in a loss of body fluids and electrolytes. It is characterized by symptoms such as heavy sweating, weakness, dizziness, headache, and nausea. The body's core temperature may rise, but it typically does not reach the critical levels associated with heat stroke.

While the heart is involved in responding to heat by increasing its output to cool the body, it is not the primary area affected in heat exhaustion. The extremities might feel cool due to reduced blood flow as the body prioritizes cooling the core, and while individuals might experience gastrointestinal distress, it is not the main focus of heat exhaustion. Therefore, the overall body suffers the most significant impact, leading to the collective symptoms of heat exhaustion.