What is sweat primarily composed of?

Sweat is primarily composed of water, with small amounts of other substances including electrolytes such as sodium, potassium, and chloride as well as urea. The high water content in sweat is essential for thermoregulation, helping to cool the body through evaporative cooling on the skin’s surface. While urea is present in sweat, its concentration is significantly lower compared to water, indicating that the primary purpose of sweating is hydration and temperature regulation rather than waste elimination.

The presence of electrolytes in sweat plays a crucial role in maintaining the body’s fluid balance and ensuring proper muscle function during exercise. This combination allows for effective thermoregulation during physical activity and helps prevent overheating. Other options do not accurately reflect the composition of sweat or its function.