Which statement about sweating is correct?

• A. Sweat cools the skin
• B. Sweat heats the skin
• C. Sweat nourishes hair
• D. Sweat changes skin color

Answer: (A)

Sweating cools the body through evaporation. When sweat is produced by sweat glands and sits on the skin, it absorbs heat from the surface as it changes from a liquid to a vapor. That heat loss lowers the skin temperature and helps regulate overall body temperature during activity or in heat. This is why you feel cooler after sweating or after intense physical work.

The other statements don’t fit: sweat doesn’t heat the skin, it doesn’t nourish hair, and it doesn’t change skin color. In humid conditions, evaporation slows down, so the cooling effect is reduced, but the fundamental idea remains that evaporation of sweat is a cooling process.