2-Chapter_5

2-Chapter_5 - Chapter 5 The Integumentary System Pages 146;...

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Chapter 5 The Integumentary System Pages 146; 157 – 158 1. Skin is the largest organ in the body Epidermis —superficial, thinner portion composed of epithelial tissue; composed of keratinized strafied squamous epithelium; contains four principal types of cells: keratinocytes, melanocytes, Langerhans cells—part of the immune system, and Merkel cells—important for touch sensation ; 90% of epidermal cells are Keratinocyes- produces the proteins kertain, also contains melanin : 8% are melanocytes – produce the molecule called melanin made from the amino acid tyrosine – helps protect from UV damage ; avascular- has no blood cells of its own and gets its nutrients from the dermis Dermis— deeper, thicker connective tissue; blood vessels, nerves, glands and hair follicles are embedded in dermal tissue; can be divided into a papillary region ( has regions called dermal papillae ) – made up of loose connective tissue and a reticular region 2. Functions of skin:
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2-Chapter_5 - Chapter 5 The Integumentary System Pages 146;...

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