Epithelial Tissue Flashcards
(48 cards)
tissue
group of cells that are similar in structure and perform a related function
histology
study of tissues
four main types of tissue
epithelial, connective, muscle, and nervous
epithelial tissue
forms boundaries between different environments, protects, secretes, absorbs, and filters
apical surface
borders open space
basal surface
next to underlying connective tissue
epithelial form
continuous sheets of cells held together by tight junctions and desmosomes
polarity
distinct apical and basal surfaces
support layer
basement membrane (basal and reticular lamina)
avascular
no blood vessels
innervated
supplied by nerve fibers
regenerative
rapidly replaces lost cell by cell division
6 aspects of epithelial tissue
form, polarity, support layer, avascular, innervated, regenerative
purpose of epithelial tissue
covers body surface or lines a cavity
1. protection
2. absorption
3. filtration
4. excretion
5. secretion
6. sensory reception
two kinds of epithelial tissue
simple- absorption, secretion, and filtration
stratified- protection
classification of epithelia
squamous
cuboidal
columnar
what does the nuclei look like in the different types of epithelia
shape of nuclei conforms to the shape of the cell
which epithelia is best for protection?
stratified
which type of epithelia is best for diffusion of gases?
simple
which type of epithelia is best for sensory reception?
simple
which type is best for packed layers of protection
squamous
which is best for secretion
cuboidal or columnar
which portion of epithelial cell in stomach would food be in contact?
apical surface
structure of simple squamous
single layer of flattened cells
disc-shaped nuclei and sparse cytoplasm