1. CytoSkeleton
By: John Mandziara

2. Made of The cytoskeleton is made up of three kinds of filaments:
1. Actin Filaments (Micro)
2. Intermediate Filaments
3. Microtubules

3. The three parts:

4. Actin Filaments
Monomers of the protein actin polymerize to form long, thin fibers. These are about 8 nm in diameter and, being the thinnest of the cytoskeletal filaments, are also called microfilaments. In skeletal muscle fibers they are called thin filaments
What they do:
1. Provide strength
2. Start Motion
3. Interact with myosin (thick) for muscular contractions

5. Actin

6. Intermediate Filaments
These cytoplasmic fibers average 10 nm in diameter and thus are "intermediate" in size between actin filaments 8 nm and microtubules 25 nm as well as of the thick filaments of skeletal fibers
Types:
1. Keratins (Hair and Nails)
2. Lamins (Stabilize the inner membrane)
3.Nuerofilaments (Strengthen the long axons of neurons)
4. Vimentins (Provide mechanical strength to muscles)

7. Intermediate

8. Microtubules
Straight, hollow cylinders whose wall is made up of a ring of 13 "protofilaments"; have a diameter of about 25 nm; are variable in length but can grow 1000 times as long as they are wide; are built by the assembly of dimers of alpha tubulin and beta tubulin; are found in both animal and plant cells.
Grow at each end by the polymerization of tubulin dimers (powered by the hydrolysis of GTP), and shrink at each end by the release of tubulin dimers (depolymerization).
Two major groups:
1. Kinesins (move toward positive end)
2. Dyneins (move toward negative end)

9. Microtubules