What is the largest organ of the human body?

The skin is the largest organ of the human body. It performs many functions: protection (a barrier against the environment and pathogens), sensation (through nerve endings), heat regulation (through blood flow and sweating), excretion (of small amounts of waste through sweat), secretion (of sebum/oil), and absorption (limited). Because the skin is central to so many cosmetology services, understanding its functions and importance is a fundamental part of the scientific-concepts content tested on the exam.