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Epithelial Coverings

Epithelial Coverings. Body armor . Epithelial coverings. In Vertebrae skin functions in protection and temperature regulation In fish, reptiles, and a few mammals the epithelium forms scales Several types of specialized glands Mammary glands Sebaceous glands Sweat glands.

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Epithelial Coverings

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  1. Epithelial Coverings Body armor

  2. Epithelial coverings • In Vertebrae skin functions in protection and temperature regulation • In fish, reptiles, and a few mammals the epithelium forms scales • Several types of specialized glands • Mammary glands • Sebaceous glands • Sweat glands

  3. Epithelial coverings • Skin produces many different structures • Skin of birds produce or form feathers. • Skin of mammals form hair, nails, or claws

  4. Epidermis • Waterproof layer • Deepest layer is the Stratum basale • Site for new skin cell production • Some of these cells produce melanin • Upper layer known as stratum corneum • Cells in this layer are keratinized • Keratin waterproofs skin and makes up hair and nails

  5. Dermis • Contains blood vessels and other structures • Collagen strengthens the skin yet allows flexibility • Elastin gives skin its elasticity. Fibrous scleroprotein found in elastic tissues such as walls of arteries. • The dermis contains • Sensory receptors • Sweat glands • Oil glands • Hair follicles are embedded in it

  6. Hypodermis • Located at the base of the dermis • This is a fatty layer important for insulation (white fat). • Infants, hibernating animals, and small rodents that live in cold areas have brown fat. • Brown fat produces heat

  7. Disorders of skin • Athletes foot • Impetigo • Psoriasis

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