The Skin

The skin is the largest organ in the human body, comprising about 15% of the body weight. The skin has three layers:

1. The epidermis, which is the outermost layer and is responsible for the barrier function of the skin. It is composed primarily of keratinocytes, which produce the protein keratin, and melanocytes, which produce the pigment melanin.
2. The dermis, which is the middle layer of the skin and provides support and nourishment to the epidermis. It contains collagen, elastin, and other fibers, as well as blood vessels and nerves.
3. The subcutaneous layer, which is the deepest layer of the skin, consisting of fat cells that provide insulation and cushioning for the body.

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