Microtubules (25nm dia, largest)
	Mitotic spindles during mitosis
		One end anchors to the microtubule organizing center (MTOC, such as centrosome and basal bodies)
				The other end is rapidly (de)polymerizing to change length
	Cell motility
		Cilia
		Flagella
	Tracks for the transport of organelles and secretory vesicles  (incl. soma<->axon terminal in nerves, a process called axonal or axoplasmic transport)
		Involves kinesin and dynein
	
	Made of alpha and beta-tubulin which form a heterodimer, which then
	polymerize to form a sheet. Said sheet rolls up to form the microtubule

	DYNAMIC (can lengthen/shorten v frequently)

Intermediate filaments (10nm dia)
	Structural/shape support, resist mechanical stress, anchor organelles, form nuclear lamina
	Composed of various keratinous proteins strung together into polymers

	PERMANENT 

Microfilaments (7nm dia, smallest)
	Gross movement of the cell (from within the cell) and changes in cell shape
		e.g. pinch the cell for celavage furropw formation (cell division)
		e.g. ameboid movement of MOs (pseudopod projections [pseudopodia] that grab
			material for ingestion)
	Composed of actin polymers twisted to form actin filaments
	
	
	DYNAMIC (can lengthen/shorten v frequently)