Ace the CNA Prometric Challenge 2026 – Unleash Your Nursing Superpowers!

The skin is the largest organ in the human body. It serves several critical functions, including protection against external hazards such as pathogens, chemicals, and physical injuries. The skin also plays a vital role in regulating body temperature and providing sensory information about the environment.

Measuring about 20 square feet in an average adult, the skin comprises three main layers: the epidermis, dermis, and subcutaneous tissue. This organ not only covers all external surfaces of the body but also contains numerous cells and structures, including sweat glands, hair follicles, and nerve endings, contributing to its multifaceted roles. Its size and the extensive functions it performs underscore its significance as a vital organ in maintaining overall health.