What is the primary function of the epidermis?

The primary function of the epidermis is to act as a protective barrier against environmental damage. The epidermis is the outermost layer of the skin that provides critical protection from various external factors such as pathogens, harmful chemicals, and physical abrasions. It serves as the body's first line of defense, helping to prevent infections and protect the underlying tissues from injury and dehydration.

The epidermis also plays a role in regulating water loss through its relatively impermeable structure, which helps maintain hydration levels within the body. While other layers of the skin contribute to functions like thermoregulation and sensation, the epidermis' primary role focuses on physical protection and maintaining the integrity of the skin.