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surroundings, skin plays an important immune system role in protecting against pathogens. its other main functions are insulation and temperature regulation, sensation, water and fat storage, vitamin a and b synthesis, and protection against light and injury. skin is considered one of the most important parts
thicker inner layer called the dermis. the epidermis is largely composed of stratified squamous epithelial cells, under which are round basal cells. the underlying dermis is made up of connective tissue, and contains sensory nerves, blood vessels, lymph channels, nerve endings, sweat glands, fat cells, hair...
https://www.newworldencyclopedia.org/entry/Skin