What is the largest organ of the human body?

The largest organ of the human body is the skin. It covers the entire body and serves several vital functions, including protection against environmental hazards, regulation of body temperature, sensation, and the synthesis of vitamin D. The skin is composed of multiple layers: the epidermis, dermis, and subcutaneous tissue, each contributing to its protective duties and overall function.

The liver, heart, and lungs, while also critical for health and functioning, are not larger in surface area or weight compared to the skin. The liver is a significant organ involved in metabolism and detoxification, the heart is essential for circulation, and the lungs are crucial for gas exchange. However, none of these organs surpasses the skin in size. This illustrates the importance and complexity of the largest organ, which plays a multifaceted role in maintaining the body's homeostasis.