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Chapter 4—Integumentary System
Skin and Body Membranes
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What is a body membrane?? A sheet of tissue that does one of the following: 1.) Cover body surfaces 2.) Line body cavities 3.) Form protective sheets
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What kind of membranes are in the body??
Epithelial Membranes made up of epithelial cells Ex.) Cutaneous, Mucous, Serous Connective Tissue Membrane made up of fibrous tissue Ex.) Synovial
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Epithelial Membranes Cutaneous Outer layer (think skin) Mucous “Wet Tissue” lines open body cavities Serous lines closed body cavities
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Cutaneous Membranes Characteristics: --Superficial Epidermis Layer --Made up of Stratified Squamous tissue --Contains Keratin becomes hard and waterproofed --Underlying Dermis Layer
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Cutaneous Membrane
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Mucous Membranes Characteristics:
--Moist Tissue --Lines body cavities “open” to the exterior --Sheet of epithelial cells --Rests on Areolar Connective Tissue (called --Lamina Propria) --Has the ability to secrete and absorb
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Mucous Membranes
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Serous Membranes Characteristics: Lines “closed” body cavities ( in the Ventral Body Cavity) 1 Layer of simple squamous tissue Rests on Areolar Connective Tissue (called Lamina Propria)
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Serous Membranes 2 Layers: Visceral (wraps around an organ) Parietal (lines the cavity)
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Serous Membranes Found in three areas:
PericardiumSerous membrane around the heart Pleura Serous membrane around the lungs Peritoneum Serous membrane around digestive organs
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Pericardium
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Pleura
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Peritoneum
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Connective Tissue Membrane
Synovial Membrane—body’s only connective tissue membrane --Found where two bones meet (Joint Articulation) --Fibrous joint capsule --Secretes Synovial Fluid to decrease friction
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Synovial Membrane
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Skin
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Skin has 3 layers: Epidermis: Outermost Layer Does not have it’s own blood supply Dermis: Supplies and Nourishes the Epidermis Connective Tissue Layer Subcuataneous Fat Layer: Made up of Adipose Tissue Absorbs Shocks and Insulates the body Anchors the skin down
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Facts about your skin: Major function is to Protect! About as thick as a paper towel Largest organ of the human body Provides a covering for your body Regulates heat loss and body temperature Keratinized and Stratified
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More Facts about your skin:
Insulates and Cushions Deeper Structures Protects from Damage Ex.) bumps, bruises, chemical & thermal , UV and bacterial protections Excretes wastes (through sweat) Manufactures Vitamin D (when in sunlight) Contains receptors that sense: touch, pressure, temperature & pain
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Structure of the Skin:
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