04_Integument

04_Integument - INTEGUMENTARY SYSTEM Chapter 5 Integument...

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INTEGUMENTARY SYSTEM Chapter 5
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Integument Structure Skin, nails, hair, sweat glands, and sebaceous glands Integument is the largest organ in the body 1.5 - 2 square meters of skin Skin accounts for 7-8% of body weight Skin thickness ranges from 1.5-4 mm
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Functions Protection (chemical, physical, and biological barrier) Prevents loss of water Temperature regulation Metabolic regulation Immune defense Sensory receptors Excretion by means of secretion
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Regions of the Skin Epidermis Epithelial tissue Avascular Dermis Connective tissue Vascular Hypodermis NOT a part of the integument Connective tissue Vascular
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Epidermis Keratinized stratified squamous epithelium Layers Stratum C orneum Stratum L ucidum Only in thick skin Stratum G ranulosum Stratum S pinosum Stratum B asale
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Cells of the Epidermis Keratinocytes most abundant produce keratin found in all layers Epidermal Dendritic Cells (Langerhans Cells) macrophages in the immune response stratum spinosum Tactile Cells (Merkel Cells) sensory receptors stratum basale Melanocytes produce melanin stratum basale
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Skin Color Hemoglobin Found in blood; causes pink hue in Caucasian skin Melanin Produced by melanocytes
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04_Integument - INTEGUMENTARY SYSTEM Chapter 5 Integument...

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