Cells and tissues Flashcards
5 characteristics of epithelial tissue
Polarity
Avascular but innervated
Ability to regenerate
Specialized contacts
Supported by connective tissue
Two generalized locations of epithelial tissue
Coverling/lining epithelia
Tissue in glands
What does the basal surface of epithelial tissue attach to
basal lamina
What is the basal lamina
an adhesive sheet
What is the function of the basal lamina
hold basal surface of epithelial tissue to underlying cells
What is the name for the top surface of epithelial tissue
Apical surface
Are apical surfaces smooth or ciliated
some can be smooth, but majority have some form of cilia
What are the four kinds of lateral contacts in epithelial tissue
Tight junctions
Adherens junctions
Desmosomes
Gap junctions
What are the “belt like” junctions1
Adherens junctions
What holds the cells together with adherens junctions (think drawstring of a bag)
Cadherins (protein)
What type of lateral contact is majorly found in areas of high stress
Desmosomes
What lateral contact forms a tunnel through the cells
Gap junction
Explain what a tight junction does
it creates an impermeable barrier - aka holds the cells super tight together (hence the name)
What between cells are fused together in a tight junction
plasma membrane
Adherens junction vs tight junction
- tight fuses plasma membranes together
- tight makes an impermeable membrane
- adherens just stops the cells from pulling apart
