If the skin of an average adult were stretched out, it would cover more than 3,000 square inches.
"The largest organ in the body is the skin. Stretched out, the skin of a typical adult would measure more than 3,000 square inches and weigh between 6 and 9 pounds."
It envelops the whole body. It acts as a barrier to keep out heat, light, harm, and illness. Additionally, the skin controls body temperature, stores water and fat, serves as a sensory organ, keeps pathogens from entering the body, separates an organism from its environment, and produces vitamin D when exposed to sunlight.
Three layers make up the skin. They are: epidermis, dermis and hypodermis (a layer of subcutaneous fat).
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