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bio lab exam

lab exam

epidermis the outer layer of the kin, is compsed of epithelial tissue
dermis is the connective tissue layer that is firmly attached to teh epidermis by a basmenet membrane, provides the avascular epidermis with nutrientsan connects the epidermis to teh underlying hypodermis
hypodermis is located below the skin and is usually discussed with the skin
kertainocytes the most numerous of the epidermal cells; produces kertain
melanocytes a pigmented cell, loacted between or benath cells of the deepest layer of the epidermis, that synthesizes melanin
Langerhans cells are immune system cells that attack pathogesns that enter the skin
Markel cells are the least abdundant cell type and are found only in the deepest layer of the epidermis
stratum basale a single row of cells attached to the basement membrane, contains stem cells that divide to form nre kertaincoytes
stratum spinosum contains 8 to 10 rows of cells, mainly kertainocytes
stratum granulosum conatins 3 to 5 rows of flattened kertainoyctes that are beggining to die
stratum lucidum conatins 3 to 5 rows of flat, dead keratinocytes
stratum corneum is a very thick layer conatining 25 to 30 or more rows of dead, squamous-shaped kertainoyctes
prokaryotes no nucleus, single cell, own dna
eukaryotes nucleus, has a membrane-bound strcutre called cytoplasm,
Gram Stain differentiates between two bacteria groups
Gram Positive Satin retrain the stain, the stain is purple in color
Gram Negative Stain can be harmful more disease causing, doesn't retrain the stain, red in color
Fungi eukaryotic organism occuring as a single cell (yeast) or a long, branching filament (mold)
Strepto a genus of gram-positive cocci that are anaerobic, non-motile and non-sporeformers. Arranged into four groups, one of which includes the beta-hemoltic pathogenic species
eukaryote an organism whose cells have a true nucleus enveloped by a nuclear membrane
prokaryote an organsim whose cells lack a true nucleus
Bacteria forms/shapes rod form, spherical form, spiral form
rod form is called bacillus
rod form come in four different forms rectangular, club, swollen, chain
spherical form comes in five different fomrs chain, packet, cluster, diplococcus 1, diplococcus 2
spiral form comes in three differetn forms single spiral , corkscrew and flagellum, corkscrew/ no flagellum
spherical form is called coccus
spiral form is called spiral
Gram Stain is often the first step in identifying a bacterium
Gram-Positive bacteria are genreally susceptible to certain antibiotics such as penicillin
Gram-Negavtive bacteria are killed by other antibiotics
stratum lucidum layer is translucent in specimens of fresh skin
Created by: Courtneey



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