Skin is the largest organ of the human body, serving as a protective barrier between the internal organs and the external environment. It has several key functions, including: 1. **Protection**: Skin shields underlying tissues from physical damage, pathogens, harmful chemicals, and UV radiation. 2. **Regulation**: It helps regulate body temperature through the process of sweating and the dilation or constriction of blood vessels.
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The skin is the external protective organ formed by interacting epithelial and supporting tissues with vessels, nerves and appendages. Barrier function, sensation, heat exchange and repair depend on that organization. The epidermis is one layer rather than the whole organ.