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Skin Functions

Skin Functions. Protects deeper tissues Aids in heat regulation Aids in excretion of urea and uric acid Synthesizes vitamin D Lubricate body surfaces Sensory receptors. Structure of the Skin. Cell and Layers of the Epidermis. Skin Structure. Epidermis – outer layer

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Skin Functions

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  1. Skin Functions • Protects deeper tissues • Aids in heat regulation • Aids in excretion of urea and uric acid • Synthesizes vitamin D • Lubricate body surfaces • Sensory receptors

  2. Structure of the Skin

  3. Cell and Layers of the Epidermis

  4. Skin Structure • Epidermis – outer layer • Stratified squamous epithelium • Often keratinized (hardened by keratin) • Dermis • Dense connective tissue layer • Hypodermis • Not part of the skin • Anchors skin to underlying organs • Composed mostly of adipose tissue (Subcutaneous fat) • Functions • energy reservoir • thermal insulation • Thickness variable, normally 1-2 mm

  5. Nails • Scale-like modifications of the epidermis • densely packed cells filled with hard keratin • Growth rate is 1 mm per week • Lack of pigment makes them colorless • Free edge • Body • Root of nail

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