The question lacks specifics, so we need to consider different interpretations.
Interpretation 1: Comparing Organs
The heaviest organ in the human body is the skin, weighing four to five kilograms. This is followed by the liver, which weighs approximately 1.5 kilograms. The brain comes in third, also weighing around 1.5 kilograms.
Interpretation 2: Comparing Body Parts
If comparing the weights of different body parts, it's important to consider the whole structure and not just individual organs. The trunk is the heaviest part of the body, making up around 55% of total body weight, followed by the thorax and abdomen.
Conclusion:
The answer depends on how you define "body part." If comparing organs, the skin is the heaviest. If comparing entire body sections, the trunk is the heaviest.