Epithelial Tissues Flashcards
(23 cards)
Simple squamous cells: function and examples
diffusion
ex. lining of vessels and heart, lung air sacs
Simple cuboidal cells: function and examples
transportation in and out of lumen and extracellular environment
ex. nephrons, some glands and their ducts
Simple columnar cells: function and examples
absorption and secretion
ex. lining of GI tract, gallbladder, small bronchi, uterine tubes, portion of uterus; some glands
Stratified squamous cells: function and examples
protection (lining exposed to “outside; frequent shedding)
ex. skin, lining of oral cavity and esophagus, lining of vagina
Pseudostratified epithelia have __ layer(s) of cells attached to __.
single; BM
Transitional epithelia have __ layer(s) of cells
multiple (specialized stratified)
Pseudostratified epithelia found in __.
upper respiratory tract
The urinary system is composed of __ cells.
appearance: full and empty?
transitional
full - simple squamous
empty - stratified cuboidal
The lining of vagina is composed __ (cells)
stratified squamous cells
The lining of the upper respiratory tract is __ (cells)
pseudostratified epithelia
Classify below junctions into two: (which are anchoring junctions)
zonulae adherentes
tight junction
desmosome
gap junction
stronger anchoring junctions:
zonulae adherentes, desmosome
weaker:
tight junction, gap junction
all junctions have __ proteins but strong junctions also have __ and __.
transmembrane proteins;
anchoring proteins, filaments
transmembranes cadherins, connexon, integrin: which junctions do they belong to?
cadherin: zonulae adherentes
connexon: gap junction
integrin: hemidesmosome
Compare and contrast the two strong anchors
both have cadherins and anchoring proteins
zonulae adherentes: actin filament
desmosome (stronger): keratin (intermediate) filament
tight junction is depenedent upon __ ion
Ca2+
between the two anchoring junctions __ is stronger than __ because __
desmosome is stronger than zonulae adherentes
keratin is stronger than actin
Blood vessels and nerves penetrate through the BM. T/F
False! Only nerves
What two cell types produce BM?
Epithelial cells, fibroblasts in CT
Primary components of BM? (the most common glycoprotein?)
Type IV collagen, glycoproteins (laminin), proteoglycans
What attaches epithelia to BM?
hemidesmosome
What is the difference between desmosome and hemidesmosome?
Desmosome: between cells
Hemidesmosome: between cells and BM
What are the components of hemidesmosome? (3)
Cell, BM, transmembrane between (integrin)
Which transmembrane does hemidesmosome have?
cadherin
connexon
integrin
integrin
