1. Cell Junctions anchoring

2. Types of Cell Junctions In plants: –Plasmodesmata In animals: ECM (Extra-cellular Matrix)- –Tight Junctions –Anchoring Junctions –Gap Junctions

3. 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.

4. Tight Junction Seals adjacent cells in a narrow band just beneath their surface. No leaks. EX: blood vessels

6. Cellular Tight Junction Biomembrane II: Membrane Junctions (click on review and Then animate)

7. Anchoring Junctions Rivet cells together with cytoskeleton structures, but still allow materials to pass along the spaces between cells

8. Where found Where you need to handle stress like: –skin –Heart –Intestine –Concept 4 Review:(desmosomes)Concept 4 Review:

9. Communicating Junctions or Gap Junctions permit small molecules to shuttle from one cell to another and thus directly link the interior of adjacent cells.

10. Communicating Junctions “Gap Junctions” Where found: –cardiac muscle for heartbeat –Hormonal stimulation –Nerves in brain release a neurotransmitter

11. Gap Junctions Concept 4 Review: Gap Junctions (click)Concept 4 Review: Gap Junctions

12. Plasmodesmata Channels connecting PLANT CELLS

13. Plasmodesmata

15. Allows small molecules and water to pass between plant cells

16. Can you identify the cell junctions?

17. Tight junction Anchoring junction Gap junction