the multicellular state part I - cell adhesion & cell junctions Flashcards
what are the 4 main tissue types?
epithelial, connective nervous &muscle
where are epithilial cells found and what is their main function?
one or a few layers of them are found on internal and external surfaces of organs often lining body cavities e.g. gut. their main function is protection
what are the tissues that lie directly below the epithelia?
connective tissue
what is the function of connective tissue?
they are tissues that support and bind structures together or involved in storage and/or transport.
give examples of connective tissues
bone, cartilage, blood, lymph, adipose
give examples of muscle tissue
striated, smooth, cardiac
is the amount of matrix and density cells the same in all tissues
no, the amount of matrix and density of cells varies between tissues.
in connective tissue, is there a high density of cells?
no, cells are sparse, so alot of matrix
what are the different types of epithelial surface?
simple columnar, and simple squamous (cells have been squashed), transitional
what is in the simple columnar epithelial surface?
consists of: apical surface, lateral surface, (Apex means the tip of something), basal (bottom) surface, basal lamina, and connective tissue
where are cell junctions especially plentiful?
in epithelia
what are the 3 functional classifications of cell junctions?
1) occluding junctions - tight junctions
2) anchoring junctions - actin filaments attachment sites and intermediate filament attachment sites
3) communicating junctions - gap junctions
what are the 3 functional classifications of cell junctions?
1) occluding junctions - tight junctions
2) anchoring junctions - actin filaments attachment sites and intermediate filament attachment sites
3) communicating junctions - gap junctions
what is the purpose of tight junctions?
to stop leaking of gut into blood
what do anchoring junctions do?
hold cells together
