Tissues Flashcards
(21 cards)
Epithilial functions
-covers skin, lines body cavities, forms body glands
- protection, absorption, filtration, secretions
Epithelial characteristics
-fit closely together in sheets.
- has apical surface that is free, unattched, expose to exterior or cavity
- basement membrane- lower resting surface, no blood supply of own, well nourished and regenerate easily
Epithelial classification
has 2 names, 1st is cell layer, and second describe the shape
Epithelial simple
1 layer- absorption, secretion, filtration
Epithelial stratified
more than 1 layer- protection
Epithelial shapes
squamous- flat
Cuboidal- cube shaped.
columnar- column shaped
simple squamous
1 layer, thin
-found; filtration and diffusion membranes, air sacs of lungs, capillary walls, serous membranes
simple cuboidal
1 layer, cube shaped
found- glands and ducts, salivary, pancreas, kidney tubule walls, ovary surface
simple columnar
single layer column shaped
- found; goblet cells(produce mucus), line digestive tract, mucous membranes( line body cavities open to exterior
pseudostratified columnar
some cells shorter than others
- nuclei appear at different heights
-ciliated one lines respiratory tract
stratified squamous
most common type
found; sites receiving friction ex; esophagus mouth, outer skin
stratified cuboidal and columnar
rare in body and found in ducts of large glands
transitional
modified stratified squamous
- lines bladder, uterus, urethra (areas subject to stretching)
glandular
endocrine
exocrine
- develop from epithelial sheets
-no connection to surface (ductless), hormone secretions diffuse directly into blood vessels within glands
-secretions empty via ducts to epithelial surface-has an exit/pathway out
connective functions
protects, supports, binds together other tissues
connective characteristics
variations in blood supply, well vascularized besides tendons ligaments cartilage
extracellular matrix-non living substance outside of cells, made up of ground substance and fibers
Connective bone
bone cells within a cavity, surrounded by hard matrix,
function; protects, supports other body organs
Hyaline (cartilage)
many collagen fibers in a RUBBARY MATRIX
- glassy blue/ white appearance
- found support structures of larynx, attaches ribs to breast bone, covers ends of bones at joints, fetus “bone”
cartilage
less hard more flexible than bone
fibrocartilage
compressible
found in disks between vertibrae
elastic (cartilage)
found in external ear
