Describe the composition and function of the extracellular matrix.

The extracellular matrix is composed on the outer edge of cells, it provides structural support to a cell in addition to performing various other important functions.   
The extracellular matrix (ECM) is composed of many proteins including: glycoprotiens, collagen fibers, fibronectin, integrins, they also contain many microfilaments for structural support.
These proteins and microfilaments can work together to serve many functions, such as providing support and anchorage for cells, segregating tissues from one another, and regulating intercellular communication.
The components of the ECM are created intracellularly, and are transported to the ECM by exocytosis. 

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In any tissue, the extracellular matrix consists of two basic components - proteoglycans and insoluble proteins. The matrix plays an important role in processes ranging from growth and development to cell death. The matrix aids in cell communication with its environment by attaching to the cell membrane or cytoskeleton.