First Aid for Corrections Officers Practice Test

The skin is considered the largest organ in the body due to its extensive surface area. It acts as a protective barrier that covers the entire body, averaging about 1.5 to 2 square meters in adults, and weighs around 4 to 5 kilograms. The skin plays a crucial role in various bodily functions, including protection against environmental hazards, regulation of temperature, and sensation.

In contrast, other organs listed, such as the heart, liver, and lungs, while essential, do not cover the external surface of the body and have a much smaller surface area compared to the skin. For instance, the heart is a muscular organ responsible for pumping blood, the liver has numerous vital functions related to metabolism and detoxification, and the lungs are primarily involved in gas exchange. Each of these organs is vital to health, but none can match the skin in terms of size and external coverage.