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The epidermis contains no blood vessels, and is nourished by diffusion from the dermis. The main type of cells which make up the epidermis are keratinocytes, melanocytes, Langerhans cells and Merkels cells. The epidermis helps the skin to regulate body temperature.
Even within the same organism, there are different types of cells. Your skin cells are different than muscle cells, or bone cells, or blood cells. Like organisms, cells can be characterized by their traits. Two common methods of distinguishing cells are by feeding mechanisms and by internal structure.