epithelial tissue Flashcards
name: main tissue types (4)
- epithelial
- connective
- muscle
- nervous
describe: epithelial tissue charac.
- covers body surfaces + forms glands
- lines:
⤷ outer surface of body
⤷ digestive, resp, urogenital sys.
⤷ heart and blood vessels
⤷ body cav. - has free (apical), basal, lateral surfaces
⤷ basement mem. (acellular glue) is attached to basal surface - avascular
- regenerative
name: func. of epithelium (5)
- protection
- barrier
- diffusion
- secretion
- absorption
explain: cell surface mod. for epi. tissues (2)
- microvilli
- finger-like struc.
- increase SA for absorp. and secret.
- stationary - cilia
- hairs (look like microvilli)
- move materials across surface
- move
name + define: classification of epi. (3, 4)
type of cells
1. simple: 1 layer of cells (all contacting basement mem.)
2. stratified: more than 1 layer of cells
3. pseudostratified: looks stratified but all connected to basement mem.
shape
1. squamous: flat
2. cuboidal: cube (width = length)
3. columnar: taller than wide
4. transitional (stratified tissue): can change shape between cuboidal/columnar to squamous when stretched
recap: func. to charac. of epithelial tissues
- simple
⤷ diffusion of gases
⤷ filtration of blood
⤷ secretion + absorption - stratified
⤷ protection (esp. for abrasion) - pseudostratified
⤷ like simple
⤷ secrete and move mucus - squamous
⤷ diffusion
⤷ filters - cuboidal + columnar
⤷ secretion + absorption
⤷ goblet cells (secrete + prod. mucus)
explain: keratin and epi. tissue
- stratified tissue can be keratinized
- non keratinized
⤷ moist
⤷ contains live cells
⤷ usually covered in fluids - keratinized
⤷ dry and moisture resistant
⤷ contains dead cells
⤷ durable
question: which tissue type can be ciliated or have microvilli?
- columnar
⤷ simple, pseudostratified
define: gland
- epithelium w/ supporting network of connective tissues
- adapted for secretion
- 2 types
name: types of glands (2)
- 2 types from epithelium
1. endocrine: no contact w/ exterior
2. exocrine: contacts exterior
**glands secreting mucus to digestive tract = exocrine
explain: endocrine glands
- no contact w/ exterior
- no ducts + prod. hormones
- secretes hormones to circulate to other organs
- secretes into ex. bloodstream
explain: exocrine glands
- contacts exterior
- has ducts
- prod. fluid (ex. sweat) and exits through body through duct
- glands secreting to digestive tract = exocrine
⤷ bc lumen = ext. surface
⤷ bc GI tract opens to exterior from mouth and anus
question: where is non ciliated columnar epithelium found?
NON CILIATED COLUMNAR
- lining of gut
⤷ absorb nut., secrete fluids
question: where is ciliated columnar epithelium found?
CILIATED SIMPLE COLUMNAR
- uterine tube
question: where is ciliated pseudostratified columnar epithelium found?
PSEUDOSTRATIFIED COLUMNAR (CILIA)
- upper resp. tract
⤷ removes unwanted phlegm/particles in eso./throat area
