front 1 Functions of the skin: | back 1 - maintains homeostasis - protective covering - prevents water loss - regulates body temperature |
front 2 What do skin cells do? | back 2 Help produce Vitamin D needed for normal bone and tooth development |
front 3 Layers of the skin: | back 3 1. Epidermis 2. Dermis 3. Subcutaneous layer (hypodermis) |
front 4 Describe the epidermis. | back 4 - Lacks blood vessels (avascular) - Thickest on palms and soles (0.8-1.4mm) - Rests on basement membrane - Replaced every 35 days |
front 5 1st layer of epidermis | back 5 Stratum corneum |
front 6 2nd layer of epidermis | back 6 Stratum lucidum (only in thick skin – palms, soles) |
front 7 3rd layer of epidermis | back 7 Stratum granulosum |
front 8 4th layer of epidermis | back 8 Stratum spinosum |
front 9 5th layer of epidermis | back 9 Stratum basale |
front 10 Epidermis: Genetic factors | back 10
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front 11 Epidermis: Physiological factors | back 11
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front 12 Epidermis: Environmental factors | back 12
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front 13 Describe the dermis. | back 13 - On average 1.0-2.0mm thick - Made up of irregular dense connective tissue - Contains muscle cells (arrector pili) |
front 14 Layer to the dermis: Papillary layer | back 14
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front 15 Layer to the dermis: Reticular layer | back 15 80% of dermis |
front 16 Describe the Subcutaneous/Hypodermis Layer. | back 16 - Composed of loose connective tissue and adipose (fat) tissue - Insulates - Major blood vessels present |
front 17 Describe hair follicles | back 17
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front 18 3 parts to hair follicles: | back 18 1. Hair shaft (above the skin) 2. Hair root (below the skin) 3. Hair papilla (base of root) |
front 19 Nail part: Nail plate | back 19 hard outer covering |
front 20 Nail part: Nail bed | back 20 under the plate; vascular |
front 21 Nail part: Lunula | back 21 half moon structure at the base mitotic division/growth |
front 22 Sebaceous Glands | back 22
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front 23 Sweat Glands/Sudoiferous Glands | back 23 - Widespread in the skin - Originates deep in the dermis or hypodermis |
front 24 Eccrine glands | back 24 - most numerous - respond to elevated body temps - found on head, neck, and back |
front 25 Apocrine glands | back 25 - respond to emotional stress - become active at puberty - found in axillary region and groin - associated with hair follicles - develop a scent (skin bacteria) |
front 26 Sweat gland: Ceruminous glands | back 26
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front 27 Sweat gland: Mammary glands | back 27 Secrete milk |
front 28 Regulation of Body Temperature | back 28 vitally important because even slight shifts can disrupt metabolic reactions. |
front 29 Hyperthermia | back 29 abnormally high body temperature |
front 30 Hypothermia | back 30 abnormally low body temperature |
front 31 Healing of Wounds and Burns | back 31
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front 32 Inflamed skin may become: | back 32 - Reddened - Swollen - Warm - Painful |
front 33 First degree burn | back 33 superficial, partial-thickness |
front 34 Second degree burn | back 34 deep, partial-thickness |
front 35 Third degree burn | back 35 full-thickness
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