AP BIOLOGY

Detailed explanation-1: -As soon as your body’s internal temperature starts rising, your hypothalamus (a small region in your brain) tells eccrine sweat glands distributed all over your body that it’s time to start cooling you down by producing sweat.

Detailed explanation-2: -Eccrine sweat glands primarily respond to thermal stimuli; particularly increased body core temperature [40], but skin temperature and associated increases in skin blood flow also play a role [9, 46–49].

Detailed explanation-3: -Not all sweat glands become able to produce sweat (it depends on the need during that time). So people who grew up in warm climates tend to have more active sweat glands than people who grew up in a climate-controlled environment or in cold climates.

Detailed explanation-4: -When the body temperature rises, the sympathetic nervous system stimulates the eccrine sweat glands to secrete water to the skin surface, where it cools the body by evaporation. Thus, eccrine sweat is an important mechanism for temperature control.

Detailed explanation-5: -Sweat glands are inactivated to deal with excessive heat. People have a widely varying number of melanocytes. When the arrector pili contracts, hair falls out. Serous fluid helps lubricate the surface of a membrane.