Extracellular Components & connections Flashcards
Function of extracellular components and connectios between cells
To help coordinate cellular activities
Extracellular structures include
Cell walls of plants
Extracellular matrix ECM
Intercellular junctions
Functions of ECM
Support
Adhesion
Movement
Regulation
Animals lack cell walls true or false
True, they are instead covered by an elaborate extracellular matrix
EMC is made up of
Glycoproteins such as
Collagen
Proteoglycans
Fibronectin
Integrins
Extracellular matrix proteins bind to receptor proteins in the plasma membrane.
Cell junctions
Tight junctions
Desmosomes
Gap junctions
Tight junctions ?
Membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid
Desmosomes
(Anchoring junctions )fasten cells together into strong sheets
Gap junctions
(Communicating junctions)
Provide cytoplasmic channels between adjacent cells
Cell wall is ?
An extracellular structure That distinguishes plant cells from animal cells
Plant cell walls are made of ?
Cellulose fibers embedded in other polysaccharides and protein
Layers of cell wall?
Primary cell wall
Middle lamella
Secondary cell wall
Primary cell wall?
Relatively thin and flexible
Middle lamella ?
Thin layer between primary walls of adjacent cells
