What are the main structures of the integumentary system?

The integumentary system is primarily responsible for protecting the body, regulating temperature, and sensing the environment. Its main structures include hair, skin, and nails, each playing a critical role in these functions.

The skin acts as a physical barrier against pathogens, UV radiation, and dehydration while also participating in thermoregulation and sensation. Hair offers additional protection, helps regulate body temperature by providing insulation, and serves a sensory function. Nails protect the tips of fingers and toes and aid in fine motor tasks by providing support and increased dexterity.

In contrast, ligaments and tendons are part of the musculoskeletal system, supporting and connecting bones and muscles. Muscles and bones are also components of the musculoskeletal system that contribute to movement and structural support. Cartilage and nerves pertain to different systems; cartilage provides flexible support in joints while nerves are essential for signaling within the nervous system. Thus, the main structures of the integumentary system are correctly identified as hair, skin, and nails.