What is the primary function of the integumentary system?

The primary function of the integumentary system is protection. This system, which includes the skin, hair, nails, and associated glands, serves as the body's first line of defense against external threats. It protects against physical injuries, harmful pathogens, and environmental factors such as UV radiation and temperature fluctuations. The skin acts as a barrier, preventing the loss of body fluids and protecting internal organs from damage.

Additionally, the integumentary system plays a role in sensation, helping the body detect changes in the environment through nerve endings in the skin. While other systems listed, such as the production of blood cells or assistance in movement, are crucial for various bodily functions, they do not pertain to the primary functions of the integumentary system.