What is the main purpose of the skin's barrier function?

The main purpose of the skin's barrier function is to prevent water loss. The skin acts as a protective barrier that helps to retain moisture within the body, which is essential for maintaining hydration and overall health. The outermost layer of the skin, known as the stratum corneum, is composed of dead skin cells and lipids that create a waterproof barrier. This barrier prevents excessive evaporation of water from the underlying tissues, helping to keep the skin and body adequately hydrated.

In addition to preventing water loss, the skin’s barrier function also protects against various environmental hazards, such as pathogens, chemicals, and physical insults. This dual role highlights the importance of the barrier function not only in hydration but also in overall skin health and integrity.