10-11-06 (13) Extracellular

10-11-06 (13) Extracellular - Extracellular Components &...

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Extracellular Components & Connections
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Extracellular Components Plasma membrane as cell boundary Most cells synthesize & secrete materials that function outside of the cell membrane
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Cell Walls of Plants The cell wall is an extracellular structure of plant cells that distinguishes them from animal cells Functions:
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Cell Walls of Plants Structure: Cellulose microfibrils embedded in a Primary cell wall Middle lamella Secondary cell wall
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Plant Cell Walls Central vacuole of cell Plasma membrane Secondary cell wall Primary cell wall Middle lamella 1 µm Central vacuole of cell Central vacuole Cytosol Plasma membrane Plant cell walls Figure 6.28
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Plant Cell Wall Primary cell wall Secondary cell wall
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The Extracellular Matrix (ECM) Animal cells lack cell walls They are covered by an elaborate matrix, the ECM
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ECM Structure Glycoproteins Proteoglycans Attach to proteins in plasma membrane
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ECM Structure Collagen Fibronectin Plasma membrane EXTRACELLULAR FLUID Micro- filaments CYTOPLASM Integrins Polysaccharide molecule Carbo- hydrates Proteoglycan molecule Core protein Integrin Figure 6.29 A proteoglycan complex
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ECM Function Support Adhesion Movement Regulation
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Intercellular Junctions Help coordinate cellular activities Direct contact between cells Numerous types
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Intercellular Junctions: Plant Cells Plasmodesmata Channels through cell walls lined by plasma membrane
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Plasmodesmata Interior of cell Interior of cell 0.5 µm Plasmodesmata Plasma membranes Cell walls Figure 6.30
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Intercellular Junctions: Animal Cells Three types of intercellular junctions Tight junctions Desmosomes Gap junctions
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Tight junctions prevent fluid from moving across a layer of cells Tight junction 0.5 µm 1 µm Space between cells Plasma membranes of adjacent cells Extracellular matrix Gap junction Tight junctions 0.1 µm Intermediate filaments Desmosome Gap junctions TIGHT JUNCTIONS DESMOSOMES GAP JUNCTIONS Figure 6.31
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Tight Junctions Where the membranes of neighboring cells are very tightly pressed against each other
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Tight Junctions
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Desmosomes Anchoring Junctions Function like rivets, fastening cells together
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Desmosomes
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Gap Junctions Communicating junctions Cytoplasmic channels between adjacent cells
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Gap Junctions
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Membrane Figure 7.1
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The Plasma Membrane The boundary that separates the living cell from its nonliving surroundings Exhibits selective permeability Allows some substances to cross it more easily than others
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Fluid Mosaic Model The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids Figure 7.3 Phospholipid bilayer Hydrophobic region of protein Hydrophobic region of protein
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The Fluidity of Membranes Figure 7.5 A Lateral movement (~10 7 times per second) Flip-flop (~ once per month) (a) Movement of phospholipids
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Figure 7.5
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This note was uploaded on 04/02/2008 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas at Austin.

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10-11-06 (13) Extracellular - Extracellular Components &...

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