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| Function of Body Membranes |
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Definition
| Line or cover body surfaces, protect body surfaces, lubricate body surfaces. |
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| Epithelial sheet with underlying connective tissue. Common locations are nose,mouth, digestive tract, often adapted for absorption or secretion. |
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| Simple Squamous Epithelium, Lines open body cavities that are closed to the exterior of the body such as lungs and heart |
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| Keratinized Stratified squamous epithelium, Skin, dry membrane, outermost protective boundary from external dangers and prevents water loss. |
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| Connective Tissue Membrane, found in joints, cushions organs moving against each other during muscle activitiy, decreases friction |
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| Skin is what type of membrane? |
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| Protection against mechanical, chemical, bacterial, and thermal damage and also ultraviolet radiation and dryness because of lack of water |
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| 2 main divisions of the skin |
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| layer that anchors the skin to underlying organs |
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| Stratum Corneum, Stratum Lucidum, Stratum Granulosum, Stratum Spinosum, Stratum Basale |
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| shingle-like dead cells, oldest cells, cells full of keratin constantly flaking off |
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| only exists in people with thick skin, |
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| Cells undergo mitosis here, most inferior epidermal layer, site of melanin formtaion, rapid cell dvision |
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| Layer where most melanocytes are found |
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| papillary layer - upper dermal region, has fingerlike projections from its superior surface called dermal papillae. Contains pain receptors and touch receptors |
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Definition
| reticular layer, deepest skin layer, contains blood vessels, sweat and oil glands |
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Definition
| found in the reticular layer, usually near hair follicles, oil glands, sebum that is secreted is typically emptied into a hair follicle but some empty on skin surface. |
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Definition
| mixture of oily substances and fragmented cells, lubricant that keeps skin soft and moist and also can kill bacteria. |
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| Two kinds, eccrine- found all over, produce sweat secreted through a pore. Sweat regulates body temp and inhibits bacteria growth. Other kind is apocrine- largely found in axillary and genital areas of the body. Secretion contains fatty acids and proteins. Secretion is odorless, but when bacteria that live on the skin uses its proteins and fats as a source of nutrients for their growth, it takes on a musky unpleasant odor |
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| layers - medulla, cortex, cuticle |
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| where produced - hair follicles, formed in the stratum basale |
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| arrector pilli - connects each side of the hair follicle to the dermal tissue. When these muscles contract, the hair is pulled puright, dimpling the skin surface with "goose bumps" |
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| nail matrix is responsible for growth |
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Definition
| extension of the stratum basale |
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| white crescent near bottom of nail, low blood supply that's why it's white |
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| caused by bacterial infection |
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| contact dermatitis (rash) |
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| caused by allergic reaction |
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| caused by bacterial infection |
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Definition
| cause is unknown, triggered by trauma, infection, stress |
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Definition
| tissue damage and cell death caused by heat, electricity, UV radiation or chemicals |
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Definition
| dehydration, electrolyte imbalance, circulatory shock |
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| division of the body into 11 areas that each are about 9%, used to determine the extent of burns, how much fluid is lost |
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Definition
| only epidermis is damaged, skin red and swollen |
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| epidermis and upper dermis are damaged, blisters |
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Definition
| destroys entire skin layer, blanched skin, gray-white or black colored, can only be fixed with grafting |
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Definition
| over 25% of the body has 2nd degree, over 10 % of body has third degree, or third degree burns of face, hands or feet |
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Definition
| least malignant or likely to spread, most common type, arises from stratum basale. |
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| arises from stratum spinosum, metasizes to lymph nodes, early removal allows a good chance of cure |
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| most deadly of skin cancers, cancer of melanocytes, metasizes rapidly, detection uses ABCD rule |
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Definition
| A= asymmetry, b= border irregularity, c= color, d= diameter 6 mm |
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