What is the primary function of the integumentary system?

The integumentary system's primary function is to protect the body against environmental hazards. This system includes the skin, hair, nails, and various glands, all of which work together to create a barrier that shields the underlying tissues and organs from physical damage, pathogens, and harmful substances. The skin acts as the first line of defense, preventing infections and minimizing water loss, while also protecting against UV radiation and other environmental factors that could harm the body.

While other options reflect important physiological processes, they do not represent the primary role of the integumentary system. For instance, the transportation of nutrients is primarily the function of the cardiovascular system, and the production of hormones is mainly associated with the endocrine system. Regulation of body temperature is another function of the integumentary system but is not its primary function; it is a secondary role influenced by the protective and sensory functions that the skin provides. Overall, the protective aspect remains the cornerstone of the integumentary system's role in maintaining overall health and homeostasis.