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Channels
Transmembrane proteins allow certain substances to cross membrane and pass into or out of the cell.
Carrier protiens
Integral proteins bind, change shape, and directly transport substances into and out of cells.
Receptors
Bind to chemical messengers (ligands), trigger sequence of events within the cells
Enzymes
Speed up chemical reactions
Structural support
When bound to the cytoskeleton (maintain shape)
Link
adjacent cells to one another. They anchor cells to tissues and allow cell to cell communication