What is a primary function of the integumentary system?

The primary function of the integumentary system, which includes the skin, hair, nails, and glands, is the regulation of body temperature. This system plays a crucial role in maintaining homeostasis by helping to control the body’s internal temperature. Through the processes of sweating and blood vessel dilation, the integumentary system assists in cooling the body when it is overheated. Conversely, it can also help to conserve heat through blood vessel constriction and other mechanisms when the body is too cold.

In addition to temperature regulation, the integumentary system serves protective functions against pathogens, physical injury, and chemical exposure, and it aids in sensation and vitamin D production. However, among the options provided, temperature regulation is the most significant primary function associated with this system, making it the correct answer in the context of the question.