What is one property of skin?

The property of skin acting as a waterproof barrier is fundamental to its role in protecting the body. The outermost layer of the skin, known as the stratum corneum, is composed of dead skin cells and lipids that create a strong barrier against water loss and the entry of pathogens. This waterproofing function is crucial for maintaining hydration and homeostasis in the body, as it prevents excessive fluid loss and helps to keep internal structures protected from external environmental factors.

In contrast, while skin does serve functions such as temperature regulation through mechanisms like sweating and blood flow adjustments, and it may hold some nutrients, these aspects are not as universally associated with skin as its barrier function. Skin does not produce digestive enzymes, which is a role more accurately attributed to organs like the stomach and pancreas. Therefore, the waterproof barrier property is the most defining and recognized function of the skin.