What are the two main divisions of the skin?

The correct answer identifies the two primary layers of the skin as the epidermis and dermis. The epidermis is the outermost layer, serving as a protective barrier against environmental factors, pathogens, and dehydration. It is composed mainly of keratinocytes, which produce keratin, a protein that helps to waterproof and strengthen the skin.

Beneath the epidermis lies the dermis, which is much thicker and contains essential structures such as blood vessels, hair follicles, and sweat glands. This layer is rich in connective tissue, providing support and elasticity to the skin. The dermis also contains nerve endings that contribute to sensory perception.

Together, these two layers perform critical functions in overall skin health and protection. The epidermis acts as the first line of defense, while the dermis supports the structure and function of the skin. Understanding these divisions is fundamental in the study of skin anatomy and its associated physiological functions.