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Skinn
| Question | Answer |
|---|---|
| 4 parts of integumentary system definition | skin, glands, hair,nails entire organ system of skin |
| functions of integumentary system | provides protection from sun and temps and infections waterproof c of keratin and allows skin to stretch self conditioning |
| thinnest and thickest skin? | thin-eyelids thick shoulders and neck |
| 2 layers of skin | dermis and epidermis |
| 2 dermis layers and definitions | papillary- bumps (dermal papillae) reticular layer- network of fibers beneath the capillary |
| epidermal ridges | found in derims. fingerprints, grip |
| line of cleavage | collagen fibers all lined up |
| hair follicle receptors definition? found? follicles dead or alive? | nerves around the hair (keratinized dead tissue) allows us to feel when the hair is being moved follicles=live cells able to undergo mitosis, also found in the skin |
| Arrector Pili example | muscle cells that can change the position of the hair goosebumbs- retain heat |
| sweat glands cool you down with what three steps? | 1. produces sweat 2. travels up thru ducts 3. spills onto skin |
| sebaceous glands-short def | produce oil to soften skin and provide protection |
| which burn need a skin graft? what about the other layers? | 3rd. 1 and 2 degree burns don't need a skin graft. |
| layers bottom to top | basal, spinosum, granulosum, lucid, corneum |
| stratum basale. 4 characteristics? | deepest layer, one cells thick, constantly undergoing mitosis, as reproduction occurs they push up |
| Stratum Spinosum 2 chars | several layers thick, undergo miitosis |
| what do the bottom 2 layers have that other dont? purpose? | melanocytes (produce the melanin) both layers chew off chunks of process (melanocytes long extensions) and take in the pigment. cells then turn their color |
| most dangerous sin cancer? cause? | melanoma cause= uncontrolled mitosis of melanocytes |
| basale cell carcinoma | uncontrolled mitosis int the stratum basale layers |
| squamos cell carcinoma | caused by stratum cells |
| Stratum Granulosum 2 chars. | 3rd layer cells kill them as they over produce keratin |
| Stratum Lucidum 4 chars.? | 4th layer Found: thick skin an dsoles an dpalms dead cells keratinization: cells kill themselves and move up |
| Stratum Corneum 2 chars? | 25-30 layers of keratinized cells cells flake off skin and the top DESQUAMATION |
| Desquamation | cells flake off skin at top |
| 3 parts of hair and definitions | shaft- above the surface root-below skin hair bulb- base of the root |
| MOST OF THE ROOT AND SHAFT ARE MADE UP OF KERATINIZED CELLS IN WHAT 3 LAYERS? | medulla- central layer, 2-3 layers of soft keratin cells cortex- most of hair, many layers of hard keratin cuticle- hard keratin |
| How does hair get its color? phagocytes | there are melanocytes in the matrix around the hair follicle -the matrix cells them engage in phagocytosis (cells eat up something) to take in melanin |
| hair follicle definition? made up of what? 2 regions? | pocket which hair grows out of ep. tissue internal and eternal epithelial root sheath |
| Matrix of hair has what kind of cells? | inside of bulb and on top of Dermal Papilla undifferentiated cells (not mature into specific job) |
| lengths of hair determined by what 2 things? | growth and rest stages(rest=follicle clings to hair and then when its over hair falls out and is replaced with new hair) |
| Nail root what is at the bottom? | Lies underneath the skin Nail matrix=undifferentiated cells |
| nail matrix makes what? rest stage? what does the matrix look like? why? CALLED? | hard keratin no white part; bc they have more layers and its thicker. called LUNULA! |
| function of nails | protection for the eend of our fingers and reinforces fingertips when we grab things |
| 2 types of glands | sweat and sebaceous |
| 2 types of sweat glands | merocrine and apocrine |
| merocrine glands | more superficial, outer part of skin. found in dermis. release sweat onto skin |
| apocrine glands | really merocrine. don't real ease cytoplasm Found in armpit and groin area. strong odor |
| apocrine found? merocrine found? | deeper in skin- the hypodermis only in dermis |
| whats does apocrine secrete? | into the hair follicle, not directly onto skin like merocrine |
| Sebaceous Glands kind? secrete? | holocrine glands (release whole cells that burst open) Secrete Sebum- the oil that softens the skin and hair |
| What type og glands are associated with acne? | sebaceous - these glands become overactive and produce too many cells in epidermis |
| Red bumps? | sebeaous glands: dead sells stick together and plug up follicle. sebum builds up and forms white head. pressure causes follicle to rupture, bacteria gets in and cause inflammation. |
Created by:
Ktfic
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