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What is the largest organ in the human body?

Find out what the largest organ in the human body is.

Most people do not realize that the largest organ is the skin. [©Shutterstock, 2010]
©Shutterstock, 2010
Most people do not realize that the largest organ is the skin.

The largest organ in the human body is the skin, with a total surface area of about 20 square feet (1.9 square meters) for an average person, or 25 square feet (2.3 square meters) for a large person and a weight of 5.6 pounds (2.7 kilograms) on the average.

Although it is not generally thought of as an organ, medically it is. An organ is a collection of various tissues integrated into a distinct structural unit and performing specific functions.

After the skin, the second largest and heaviest organ is the liver, weighing 2.5 to 3.3 pounds (1.1 to 1.5 kilograms). The liver is the body's chemical factory and regulates the levels of most of the body's chemicals.

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