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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Body Membrane
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function is to cover surfaces , line body cavities , anchor organs , form protective & lubricating sheets
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Types of Body Membranes
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Epithelial Membranes
& Connective Tissue Membranes |
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Epithelial Membranes
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contain epithelium & connective tissue components .
3 types : cutaneous / mucous / serous membrane |
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Cutaneous
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-protects body surface
-exposed to school |
skin membrane
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Mucous Membrane
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-lines body cavities open to exterior
-may secrete mucous |
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Serous Membrane
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-closed to exterior
-lines the ventral body cavity -occur in pairs (parietal & visceral) |
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Parietal Layer
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-furthest from the organ
-fuses with cavity wall (folds into itself to form Visceral layer) |
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Visceral Layer
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-inner layer clings to organs external wall
-allows organs to slide easily without friction |
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Connective Tissue Membrane
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-composed of soft areolar tissue & no epithelial cells at all
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Synovial Membranes
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-lines joint cavities
-provides smooth surface & secrete lubricating fluids |
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The Integumentary System
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-consists of the skin, hair, nails & glands
- keeps H2O and other molecules in the body , while keeping H2O (waterproof) and other substances (bacteria,chemicals) out |
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Structure of the Skin (aka cutaneous membrane)
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outer layer = epidermis
inner layer = dermis |
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Epidermis
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-Avascular (no blood supply)
-keratinocytes are part of the epidermis (produce keratin) -melanocytes are part of the epidermise (produce melanin) |
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Dermis
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-below the epidermise
-provides nutrients to the epidermise -vascualr (blood supply) -has pain and touch receptors -ridges are formed to make fingerprints -collagen fibers (responsible for toughness of dermis & attracts and binds H2O) -elastic fibers (gives elasticity) |
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Skin Colour
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1.Melanin- found in the epidermise (yellow to black colour)
2.Carotene- deposited in epidermise (orange to yellow colour) 3. Hemoglobin- pigment in blood cells that carry oxygen (flushed, hot, appear redder) |
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Burns
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-tissue damage and cell death caused by intense heat, electricity, UV radiation & Chemicals
-2 life threatening problems: loss of fluid & infection |
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Loss of Fluid
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-loses fluid containing proteins and electrolytes
-dehydration and electrolyte imbalance follow -kidneys shut down & circulatory shock (decreased blood volume) |
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Infection
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-leading cause of death
-pathogens invade are where skin is destroyed and immune system is low |
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Classification of Burns
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1st Degree- epidermis only. red swollen heals 2 to 3 day
2nd Degree- epidermise and upper layer of dermis. blisters appear, regrowth can occur, usually no scars 3rd Degree- thickness of skin. burn is not painful because nerve endings have been destroyed (regeneration not possible) |
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Skin Cancer
Basal Cell Carcinoma |
-least malignant & most common
-metastasis (spreading) seldom occurs |
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Skin Cancer
Squamous Cell Carcinoma |
-grow fast & metastasize to lymph nodes
-lesions are scaley, reddened, ulcer with raised border |
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Skin Cancer
Malignant Melanoma |
-cancer of melanocytes (melanin producing cells)
-often deadly -appear from moles or spontaneously -metastasizes rapidly to lymph nodes & blood vessels |
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ABCDE Rule
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Asymmetry-two sides of mole do not match
Border Irregularity-boarders are not smooth Colour-contain different colours Diameter-larger than 6 mm Elevation-above skin surface |
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