Extra cellular components

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Presentation transcript:

Extra cellular components Image Credit: Fine structure of collagen circa 1948 Collagen microfibrils © 2016 Paul Billiet ODWS

The extracellular matrix Plant cell secrete cellulose and other carbohydrates Fungi and insect cells secrete chitin Bacteria secrete murin Animal cells secrete proteins (e.g. collagen) glycoproteins and other conjugated proteins © 2016 Paul Billiet ODWS

Functions of extracellular matrix Mechanical, they give tissues strength and elasticity Protection against extracellular change and retention of water Control of cell behaviour by binding of growth factors and interaction with cell-surface receptors © 2016 Paul Billiet ODWS

Animal tissues Image Credit; www.steve.gb.com/

THE PLANT CELL WALL The formation of a cell plate starts as soon as the nucleus has divided © 2016 Paul Billiet ODWS

Cell plate to cell wall The cell plate becomes the middle lamella that glues the cells together New cell wall material is secreted either side of the middles lamella = primary cell wall (no cellulose) © 2016 Paul Billiet ODWS

When this forms the cell stops growing and takes its final form Growth of the cell is orientated by the appearance of cellulose microfibrils Plasmodesmata Sap vacuole The secondary cell wall consists of cellulose microfibrils secreted inside the primary cell wall When this forms the cell stops growing and takes its final form © 2016 Paul Billiet ODWS

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