Epithelium Part 1 Flashcards
What are these the main characterstics of:
Regenerative
Built into basement memebrane
Avascular
Epithelium
Are are made of glycoprotein fibers
Secreted by epithelial cells
Anchor the basal layer of the epithelium?
Basement membrane
Glycoprotein fibers:
Where are basal lamina from?
Epithelium cells
Glycoprotein fibers:
Where are reticular lamina from?
Connective tissue cells
Is there vascularization in the basement membrane?
No
What are motile, carrying materials across the surface?
Cilia epithelium
What forms a brush border to enhance surface in absorptive and excretory epithelia?
Microvilli
What are extensions of cell membrane with an inner flexible scaffold of actin filaments?
Microvilli
What are long microvilli, non motile, lack filamentous core- basically long finger like projections of memebrane
Ex: hair cells in inner ear?
Stereocilia
What is an epithelial covering dry surfaces
-Upper layer of dead cells, firmly attached, provide impermeable flexibility to miniseries dehydration?
Keratinization
What is the fusion of intramembranous particles from adjacent cells
Contiguous membranes become indistinguishable even with EM
Columnar cells, apical border, to block small microorganisms from passing in between cells
Ex: intestinal mucosa
?
Tight junction
What is less tight of a union, membranes are dinstinguiable with EM
Cuboidal and columnar epithelia, various tissues
?
Terminal bars
Discontinuous junctions
Composed of 2 hemidesmosomes anchored to their corresponding cells by tonofilaments
mainly squamous epithelium of epidermis
?
Desmosomes
Conduits between adjacent cells, allow passage of ions and small molecules
Cuboidal epithelium - renal tubule
Gap junctions
What exocrine by excretion method is:
Release by exocytosis, cytoplasm intact
Merocine
What exocrine by excretion method is:
Secretion is terminal, cells disintegrate
Holocrine
What exocrine by excretion method is:
Membrane-bound blebs of cytoplasm
Apocrine
Type of secretion?
Mucins (glycosylated proteins)- hydrated into mucus
Lubrication/protection
Ex: goblet cells
Mucus
Type of secretion?
Proteins (non-glycosylated)- digestive enzymes
Ex: pancreas
Serous
Type of secretion?
Combinations of digestive enzymes and mucus
Ex: salivary gland
Seromucous
