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Unformatted text preview: The Epidermis The epidermis consists of keratinized stratified squamous epithelium. Four cell types are present: Keratinocytes produce keratin, a protein that hardens and waterproofs the skin. Mature keratinocytes at the skin surface are dead and filled almost entirely with keratin. Melanocytes produce melanin, a pigment that protects cells from ultraviolet radiation. Melanin from the melanocytes is transferred to the keratinocytes. Langerhans cells are phagocytic macrophages that interact with white blood cells during an immune response. Merkel cells occur deep in the epidermis at the epidermal-dermal boundary. They form Merkel discs, which, in association with nerve endings, serve a sensory function. There are several layers making up the epidermis. Thick skin, found on the palms of the hands and soles of the feet, consists of five layers while thin skin consists of only four layers. Below is a list of soles of the feet, consists of five layers while thin skin consists of only four layers....
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This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.
- Spring '10