Epithelium questions Flashcards
What components of a cell are labeled by Hematoxylin?
Basic stains (-) Bind acidic tissue components Heterochromatin nucleolus Rough ER Sulfated GAGs
What components of a cell are labeled by Eosin?
Acidic stains (+) bind basic structures and components Cytoplasm Cytoplasmic filaments Collagen fibers Basement membrane
What are two functions of a simple squamous epithelium?
Movement and secretion
What type of epithelium is best designed to protect against abrasion?
Stratified squamous keratinized epithelium
Sterocila
Long, nonmotile extensions of the apical surface
-male reproductive tract
Striated border
Microvilli and glycocalyx found in small intestine
hypertrophy
increased size
Hyperplasia
increased number
metaplasia
transform- heavy smokers respiratory epithelium of bronchi
-transformed into stratified squamous epithelium
Compare the structure and dimensions of microvilli and cilia
Microvilli- fingerlike extensions (1 micron hight and 0.08 microns wide) found on the apical surface of epithelial cells
Cilia- found on the apical surface of some cells in the respiratory system
9+2 arrangement of microtubules and are covered by the cell membrane producing a structure 5-10 microns long and 0.2 microns in diameter
Name two tissues that have basement membranes. are they visible in the light microscope?
Skin, Respiratory tract, GI tract
YES
What is another name for respiratory epithelium
pseudo stratified columnar epithelium
What junctions are found in the lateral membrane domain of an intestinal epithelial cell?
Zona occludens- tight junctions
Zona adherens
Desmosomes- hemidesmosomes- help bind epithelial cells to the basal lamina
Gap junctions
Name the three types of microvilli. Give an example of a cell type possessing each
Striated border- small intestine
Brush border- renal tubule
Sterocilia- male reproductive tract
List the histological features that allow you to distinguish thick skin from thin skin
# of epidermal layers Thick lacks hair follicles and sebaceous glands
