The integumentary system is the body's largest organ system, primarily consisting of the skin, hair, nails, and various glands. Its main functions include protecting the body from external damage, regulating temperature, and providing sensory information. The skin acts as a barrier against pathogens and helps prevent dehydration. In addition to protection, the integumentary system plays a role in vitamin D synthesis, which is essential for bone health. The hair helps regulate body temperature and provides insulation, while nails protect the tips of fingers and toes. Glands within the skin produce oils and sweat, contributing to overall skin health.