What is the primary function of the epidermis layer of the skin?

The primary function of the epidermis layer of the skin is to act as a barrier to environmental damage. This outermost layer of skin provides a protective barrier against pathogens, chemicals, and physical irritants. It is composed primarily of keratinocytes, which produce keratin, a protein that helps to waterproof the skin, making it less permeable to water and substances from the environment.

The structure of the epidermis includes several layers, with the outermost layer being made up of dead skin cells that constantly shed and renew. This process is vital for maintaining skin health and protecting the underlying layers and organs from infection and injury. By forming this barrier, the epidermis supports the overall function of the skin in protecting the body and maintaining homeostasis.