Cellular organisation of tissues
- Created by: Grace Richardson
- Created on: 04-01-14 15:06
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- Cellular organisation of tissues
- Junctions
- Tight Junctions
- Zonula Occludens
- Seals paracellular pathways
- Segregates apical and basolateral polarity
- Adhesion belts
- Usually basal to apical tight junction
- Transmembrane adhesion molecule is cadherin which associates with the microfilament cytoskeleton
- Master junction - controls the stability of other junctions
- Gap Junctions
- Macula Communicans
- Cluster of pores made of 6 subunits
- Passage of ions and small molecules
- Desmosomes
- Macula adherins
- Linked to intermediate filament cytoskeleton
- Cadherin like transmembrane molecule
- Synapses
- Junctions between neurones
- Tight Junctions
- Cytoskeleton
- Microtubules
- Polymers of a and b tubulin
- Found in cilia flagella and mitotic spindle
- Accessory proteins for motility
- Maintains cell shape
- Average diameter is 20nm
- Intermediate filaments
- Provide strength and stability to nuclear envelope
- Different in each type of cell
- Filamentous - rope like
- Connect desmosomes via cytokeratins
- Microfilaments
- Actin polymers
- Globular proteins with a helical structure
- Adhesion and contraction
- Involved in cell shape and movement
- Involves accessory proteins e.g. myosin
- Microtubules
- Junctions
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