Epithelial tissue Flashcards

Terms Definitions
stratified epithelia
range from 2 to 20 or more layers of cells, with some cells resting directly on others and only the deepest layer attached to the basement membrane
keratinized stratified squamous epithelium
multiple cell layers with cells becoming increasingly flat, scaly, and dead toward the apical surface covered with a layer of compact cells without nuclei; basal cells may be cuboidal to columnar
keratinized stratified squamous epithelium
located in the epidermis, & palms and soles of feet; strong -> resists abrasion and penetration by pathogenic organisms and retards water loss through skin
non-keratinized stratified squamous epithelium
same as keratinized but lacks the surface layer of dead cells, resists abrasion and penetration of pathogens and is located in the tongue, oral mucosa, esophagus, anal canal, vagina
stratified cuboidal epithelium
two or more layers of cells & surface cells are square/rounded
stratified cuboidal epithelium
contributes to secretion of sweat, sperm cell production, produces/secretes ovarian hormones; located in sweat gland ducts, sperm-producing ducts (seminiferous tubules) of testes, and egg-producing vesicles (follicles) of ovaries
transitional epithelium
allows for distention -> stretches (from round to flat) to allow bladder filling of urinary tract; located in urinary tract - part of kidney, ureter, bladder, part of urethra, umbilical cord
transitional epithelium
resembles stratified squamous epithelium, but surface cells are rounded, not flattened, & often bulge at surface, typically 5 or 6 cells thick when relaxed & 2 or 3 cells thick when stretched, cells may be flatter & thinner when epithelium is stretched; some cells have 2 nuclei
found in epidermis, covered with a layer of compact, dead squamous cells; strong & very resistant to abrasions
lacks the surface layer of dead cells; strong & very resistant to abrasions
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