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Cell Junctions anchoring Types of Cell Junctions • In plants: – Plasmodesmata • In animals: ECM (Extra-cellular Matrix)– Tight Junctions – Anchoring Junctions – Gap Junctions Extracellular Matrix • Sticky layer of glycoprotein holding cells together • The extracellular matrix (ECM) is the largest component of normal skin and gives the skin its unique properties of elasticity, tensile strength and compressibility. Tight Junction • Seals adjacent cells in a narrow band just beneath their surface. • No leaks. • EX: blood vessels Cellular Tight Junction • Biomembrane II: • Membrane Junctions (click on review and Then animate) Anchoring Junctions • Rivet cells together with cytoskeleton structures, but still allow materials to pass along the spaces between cells Where found • Where you need to handle stress like: –skin –Heart –Intestine –Concept 4 Review:(desmosomes) Communicating Junctions or Gap Junctions • permit small molecules to shuttle from one cell to another and thus directly link the interior of adjacent cells. Communicating Junctions “Gap Junctions” • Where found: –cardiac muscle for heartbeat –Hormonal stimulation –Nerves in brain release a neurotransmitter Gap Junctions • Concept 4 Review: Gap Junctions (click) Plasmodesmata • Channels connecting PLANT CELLS Plasmodesmata Plasmodesmata • Allows small molecules and water to pass between plant cells Can you identify the cell junctions? Can you identify the cell junctions? Tight junction Anchoring junction Gap junction
