Flashcards in Chap 1 Part 1 Deck (67)
What are the 3 general function of epithelium?
absorption, secretion and providing a barrier
What are the 3 specialized functions of epithelium?
transport molecules across epi, selective permeability, and sensory
T/F: epithelial cells being adjacent to each other is a characteristic shared among all types of epithelium.
What are the two types of basement membranes that epithelial cells are associated with?
either complete or partial basement membranes
What are the parts of a complete basement membrane?
basal lamina and reticular lamina
What are the parts of a partial basement membrane?
basal lamina only
What produces the basal lamina?
What produces the reticular lamina?
fibroblasts in connective tissue
What are the 3 main functions of a basement membrane?
provides a surface for epithelial cell attachment, molecular filter, and limits stretch
T/F: collagen I fibers can stretch.
false; this how basement membranes limit stretch
T/F: epithelium is directly supplied by blood vessels.
False; epithelium is avascular and cells obtain nutrition by diffusion
What are the 2 functions of CT?
provides nutrition and source of defensive cells
What are epithelial cells held together by?
What are the 4 types of cell junctions?
Zonula Occludens, Zonula Adherens, Macula Adherens, and Gap Junctions
Which type of cell junction is considered a tight junction?
Which type of cell junction involves sharing of intrinsic membrane proteins between adjacent cells?
What are the two functions of the Zonula Occludens?
Provide strong attachment and prevent passage of material between cells
Which type of cell junction can be considered and adhesion belt?
Which type of cell junction consists of cadherins and marginal bands?
What are cadherins?
Linkage proteins between cells
What are marginal bands?
microfilaments which attach the cytoskeleton to the cell membrane
What are the two functions of the Zonula Adherens?
strong attachment function and provide cell structural stability
Which cell junction is essentialy just desmosomes?
What is the function of the macula adherens?>
Which type of cell junction consists of six connexins arranged in a cylinder?
What are connexins?
proteins; a complete structure
What are the 2 functions of Gap Junctions?
strong attachment, and transport materials
Which types of cell junctions function is providing a strong attachment?
What is the Junctional Complex?
Zona Occludens, Zona Adherens, and Macula Adherens