The skin, hair, nails, glands, and nerves make up the integumentary system, which is made up of various organs and components. The integumentary system’s major role is to protect the inside of the body from environmental elements such as bacteria, pollutants, and UV rays from the sun.

Skin. The skin is the body’s biggest and heaviest organ. It must cover the full outside of the body, from the top of a person’s head to the end of their toes, in order to operate as a protective barrier. The skin is around 2 mm thick (0.079 inches thick) and weighs roughly 6 pounds in total.

Nail. The function of the nail is to protect fingers and toes from injury or trauma and sensation or to assists with the sense of touch.

Hair. This serves as a protection for the skin, regulation of body temperature, evaporation and perspiration process and to help with the nerve sensing functions of the integumentary system.

Reference: Christiansen, S. (2021, November 15). The integumentary system: Your skin, hair, nails, and glands. Verywell Health. https://www.verywellhealth.com/the-integumentary-system-anatomy-and-function-5114485