Illinois Cosmetology Practice Exam 2025 – All-in-One Guide to Master Your Licensing Test!

The outermost layer of the skin is known as the epidermis. This layer serves as a protective barrier for the underlying tissues and organs, preventing the entry of harmful pathogens and minimizing water loss. The epidermis is composed of several layers of cells that regenerate continuously, helping to maintain the skin's health and appearance.

In addition to protection, the epidermis is also involved in other essential functions such as sensation and pigmentation. The cells within the epidermis include keratinocytes, which produce keratin, giving the skin its strength and waterproof properties.

Comparatively, the dermis, located beneath the epidermis, contains connective tissue, hair follicles, and sweat glands. The subcutaneous layer lies below the dermis and primarily consists of fat and connective tissue, which aids in insulation and cushioning for the body. Connective tissue is a general term describing various tissue types that support, bind, and protect other tissues and organs, but it does not specifically refer to the skin's outer layer.