The integumentary system helps to prevent:

The integumentary system, which includes the skin, hair, nails, and associated glands, plays a crucial role in protecting the body from various dangers. One of its primary functions is to act as a barrier against infection by preventing pathogens, such as bacteria and viruses, from entering the body. The skin's outermost layer, the epidermis, is specifically designed to provide this protective barrier.

In addition to infection prevention, the integumentary system also plays a vital role in preventing dehydration. The skin helps to retain moisture and minimize water loss from internal body compartments. By doing so, it helps maintain proper hydration levels, which is essential for overall health. The presence of oils and natural moisturizers in the skin contributes to this function by forming a protective layer that traps moisture.

While the other options presented may relate to various physiological functions, they do not directly reflect the protective roles of the integumentary system. Hence, the integumentary system is pivotal in preventing both infection and dehydration, making this choice the most accurate representation of its functions.