What is the function of Langerhans cells in the skin?

Langerhans cells play a crucial role in the skin's immune response, acting as antigen-presenting cells that help protect the body from infections. They are a type of dendritic cell found predominantly in the epidermis and are key players in the body's first line of defense. Upon encountering pathogens, Langerhans cells capture and process these foreign invaders, then migrate to lymph nodes where they present the antigens to T cells. This activation of the immune system aids in producing a targeted response against infections.

The other choices focus on different skin functions. Producing melanin pertains to melanocytes, which are responsible for skin pigmentation and protection against UV radiation. Providing structural support relates to fibroblasts and collagen, which contribute to the skin's strength and elasticity. Regulating moisture levels involves sebaceous glands and other mechanisms that maintain skin hydration but does not pertain to the function of Langerhans cells.