Epithelia Flashcards
Where is simple squamous epithelium found?
blood vessels
Where is simple cuboidal epithelium found?
kidney tubule
Where is simple columnar epithelium found?
GI tract
Where is transitional epithelium found?
bladder
Where is stratified squamous epithelium found?
skin
Where is stratified cuboidal epithelium found?
reproductive system
Where is pseudostratified columnar epithelium found?
respiratory
What are the functions of these cells?
exchange transporting ciliated protective secretory
What is the structure of exchange cells?
1 cell layer - flattened
What is the structure of transporting cells?
1 cell layer - cuboidal or columnar
What is the structure of ciliated cells?
1 cell layer - cuboidal or columnar
What is the structure of protective cells?
many cell layers - flattened
What is the structure of secretory cells?
1 or many cell layers - columnar
What do epithelial cell junctions act as?
barriers
fences
gates
How do tight junctions determine the function of transporting epithelia?
they create apical and basal membrane domains which allows trans-epithelial vectorial transport which creates compartments with different compositions
What are the two ways cell transport can occur in tight junctions?
trans-cellularly
paracellularly
What is the part of the tight junction that keeps the cell together called?
sealing strands
What distinguishes leaky and tight epithelial layers?
more sealing strands creates a more effective barrier
Where can leaky tight junctions be found?
kidney
Where can tight epithelium be found?
bladder
What is the function of tight junctions acting as barriers?
separate one compartment from another
What is the function of tight junctions acting as fences?
maintain the asymmetric distribution of lipids and proteins in the apical and basal membranes
What is the function of tight junctions acting as gates?
allow some molecules to flow more easily than others
