Integumentary system
The integumentary system is the largest organ on the human body. The integumentary system consists mostly, and the hair, nails, glands, muscles, and nerves. The skin functions include protection, sensation, body temperature regulation, excretion and absorption, and the synthesis of vitamin D. The hairs offer a limited amount of protection and also function in sensing light touch. The integumentary system is made up of a layer of tissues that guard underlying muscles and organs. The integumentary system is located in the skin. If we didn't have the integumentary system we would we would get sick very quick and very likely to die.