Integumentary System -The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. -It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. -In order to do these things, the integumentary system works with all the other systems of your body, each of which has a role to play in maintaining the internal conditions that a human body needs to function properly.