What is the largest organ of the body?

The largest organ of the body is the skin. Covering the entire exterior of the body, the skin serves several vital functions including protection, regulation of body temperature, and sensory perception. It is composed of multiple layers – the epidermis, dermis, and subcutaneous tissue – which work together to form a barrier against pathogens, maintain hydration, and facilitate the body’s interactions with the environment.

The heart, liver, and lungs, while essential organs with important roles in the circulatory, digestive, and respiratory systems respectively, are not as extensive in surface area and mass as the skin. This foundational understanding is critical in fields such as medicine and emergency response, as it underscores the importance of skin integrity in patient assessment and care.