GENERAL HISTOLOGY

Detailed explanation-1: -Sweat is mostly water, but it does contain some electrolytes, since it is derived from blood plasma. The presence of sodium chloride gives sweat a salty taste. The total volume of sweat produced depends on the number of functional glands and the size of the surface opening.

Detailed explanation-2: -Sebaceous glands produce an oily substance called sebum and sweat glands produce a watery substance called sweat.

Detailed explanation-3: -Their secretion is largely water (usually about 99 percent), with small amounts of dissolved salts and amino acids. 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.

Detailed explanation-4: -When we get too hot, sweat glands in the skin release more sweat. The sweat evaporates, transferring heat energy from the skin to the environment. Blood vessels leading to the skin capillaries become wider-they dilate-allowing more blood to flow through the skin and more heat to be lost to the environment.