Download Cell Motility - Cochran`s Half Acre

Cell Motility:
Cell motility or cell movement (2 types)
– Movement of the entire cell by Cilia/Flagella
– Structures moving within the cell - Motor Protein
Components of the Cytoskeleton:
• Microtubules
– Tubulin subunits
– Cell division and
movement
• Microfilaments
– Actin subunits
– Movement and shape
http://anatomy.med.unsw.edu.au/teach/phph1004/1998/WWWlect4/img024.jpg
Components of the Cytoskeleton:
• Intermediate Filaments
– Only in animal cells of
specific tissues
– Mechanically
strengthen cells or cell
parts and help maintain
shape
– Six known groups
Structural Basis of Cell Motility:
• Three Mechanisms
– Parallel microtubules slide in
opposite directions
• Microtubule Movement
– Shunting of organelles
• Shunting organelles 1
• Shunting organelles 2
– Length of microtubule or
microfilaments can change due
to rapid assembly and
disassembly of subunits making
up the tubules or filaments
http://www.molbiol.umu.se/forskning/gullberg/Introduction%20to%20Microtubules%20and%20Op18-filer/MTdynamik.jpg