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network of material secreted from the cells forming a complex meshwork outside of cells
protein of ECM
fibronectin and laminin, have multiple binding site so they are able to bind to extracellular proteins as well as to cell surface
at least 27 different type of collagens in humans
25% of total protein is collage
75% of protein in mammalian skin
assemble into fibrils
polysaccarides in animal ECM
after protein, 2nd major component
highly negative change
GAGs= most abundant in vertebrates
attach cells to each other and the ECM
rely on cell adhesion molecules (CAM)
by expressing only certain types of cadherins, each cell will only bind to other expressing the same type
tight junctions in animals
forms tight seal between adjacent cells
made by occludin and claudin
gap junctions in animals
small gap between plasma membranes of cells at junction
6 connexin proteins align with 6 from adjacent cell to form connexon
A channel formed in a gap junction by the attachment of six connexin proteins on one cell to six connexin proteins on another
middle lamella in plants
First layer to form when cells dividing and Cement cell walls of adjacent cells together
plasmodesmata in plants
Plasmodesmata link nearly all plant cells together, this allows the free exchange of necessary materials like water, RNA molecules, small solutes, and some small proteins
6 basic cell processes
1. Cell division
2. Cell growth
6. Cell connections
4 general types of animal tissue
1. Epithelial tissue
2. Connective tissue
3. Nervous tissue
4. Muscle tissue
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