Explain how sweat is formed and expelled through the skin
Answers
Answer:
Sweat is formed in sweat glands under the surface of the skin.
Evaporation of sweat from the skin surface has a cooling effect due to evaporative cooling.
The clear secretion produced by eccrine sweat glands is termed sweat or sensible perspiration.
Sweat glands, either of the two types of secretory skin glands appear only in mammals. The eccrine perspiration organ, which is constrained by the thoughtful sensory system, directs internal heat level. As the internal temperature increases, the eccrine glands secrete water on the surface of the skin, where the heat is evacuated by evaporation. While the eccrine glands are active over most of the body (such as horses, bears, and humans), they are an important thermoregulatory device. In other animals (dogs, cats, cattle and sheep), they are active only on the pads of the legs or along the edges of the lips and may be absent on the rest of the body. these animals often depend on respiration for effective temperature control. Small mammals, such as rodents, can not withstand dehydration and therefore do not have eccrine glands.
The apocrine sweat glands, usually associated with hair follicles, continuously secrete sweat into the glandular tubule. Emotional stress causes contraction of the tubule wall, expelling fat secretion from the skin, where local bacteria break it down into odorous fatty acids. In man, the apocrine glands are concentrated in the armpits and genital regions; the glands are inactive until they are stimulated by the hormonal changes of puberty. In other mammals, the apocrine glands are more numerous. Certain specialized glands, such as mammary glands, wax-secreting ear canal glands and many mammalian odor glands, have probably developed from modified apocrine glands.