cell junctions
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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 Junctionsor 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