The sudoriferous (sweat) glands act mainly in temperature regulation by releasing a watery fluid that evaporates to cool the body.
The sebaceous glands release an oily fluid, sebum, that lubricates the hair and skin and prevents drying. Hair is widely distributed over the body. Each hair develops within a sheath or hair follicle and grows from its base within the deep layers of the skin. Both hair and nails function in protection. Each nail develops from a growing region at its proximal end. Hair and nails are composed of nonliving material consisting mainly of keratin.
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