sentences:  The white sediment in otherwise colorless eccrine secretions is caused by evaporation that increases the concentration of salts.The odour from sweat is due to bacterial activity on the secretions of the apocrine sweat glands, a distinctly different type of sweat gland found in human skin.Eccrine glands are innervated by the sympathetic nervous system, primarily by cholinergic fibers whose discharge is altered primarily by changes in deep body temperature (core temperature), but by adrenergic fibers as well.