Which of the following is NOT a function of the integumentary system?

The integumentary system encompasses the skin, hair, nails, and glands, and it plays several critical roles in maintaining overall health. One of its primary functions is the protection against pathogens, serving as a physical barrier that helps prevent infections. Additionally, it regulates body temperature through mechanisms such as sweating and adjusting blood flow to the skin. Another vital role of the integumentary system is to prevent water loss from the body, which is essential for maintaining hydration and homeostasis.

In contrast, the production of vitamin E does not occur through the integumentary system. Instead, vitamin E is primarily obtained from diet and absorbed through the digestive system. While the skin can synthesize vitamin D upon exposure to sunlight, vitamin E does not follow this pathway. Thus, identifying the production of vitamin E as a function not associated with the integumentary system clarifies its distinct role compared to other essential functions of this system.