<P> Perspiration, also known as sweating, is the production of fluids secreted by the sweat glands in the skin of mammals . </P> <P> Two types of sweat glands can be found in humans: eccrine glands and apocrine glands . The eccrine sweat glands are distributed over much of the body . </P> <P> In humans, sweating is primarily a means of thermoregulation, which is achieved by the water - rich secretion of the eccrine glands . Maximum sweat rates of an adult can be up to 2--4 liters per hour or 10--14 liters per day (10--15 g / min m2), but is less in children prior to puberty . Evaporation of sweat from the skin surface has a cooling effect due to evaporative cooling . Hence, in hot weather, or when the individual's muscles heat up due to exertion, more sweat is produced . Animals with few sweat glands, such as dogs, accomplish similar temperature regulation results by panting, which evaporates water from the moist lining of the oral cavity and pharynx . </P> <P> Horses have armpits that sweat like those of primates such as humans . Although sweating is found in a wide variety of mammals, relatively few (exceptions include humans and horses) produce large amounts of sweat in order to cool down . </P>

Sweating can have a cooling effect due to