What is the skin's largest organ?

The integumentary system is the body's largest organ, which includes the skin as its primary component. The skin performs essential functions such as protection from environmental hazards, regulation of body temperature, sensation, and production of Vitamin D. It acts as a barrier against pathogens and physical damage, as well as helps in the regulation of fluids and electrolytes. The skin's extensive surface area and multiple layers of cells underscore its importance as an organ in this system.

The liver, heart, and brain, while vital organs within the body, do not encompass the same breadth and multifunctionality as the skin. The liver has crucial functions related to metabolism and detoxification, the heart is central to the circulatory system, and the brain serves as the control center for the nervous system. However, none of these organs cover the vast surface area and protective abilities characteristic of the integumentary system. Thus, the integumentary system, incorporating the skin, is rightly recognized as the largest organ of the body.