The integumentary system consists of the skin, nerves, hair, nails and sweat glands, which work together to protect the body from the outside world and maintain the right balance of internal body conditions for healthy functioning. One of the system’s key functions is to maintain and regulate body temperature. It may do this by changing the pattern of blood supply to the skin or by sweating. Body systems and organs progressively fail as the body’s temperature rises above or falls below the normal body temperature of about 37° C.