1. Cytoskeleton-Centrioles
By: Tim, Dylan, Jarrod, and Brianna

2. Internal Skeleton/Cytoskeleton
Components of the Cytoskeleton
Tubulin Protein
Form Microtubules (to be discussed more later)
Actin Filaments or actin proteins
Form Microfilaments
Intermediate Filaments
The cytoskeleton of the cell is the overall structure of a eukaryote
Contains filaments and motor proteins that allow components of the cell to move while still remaining rigid
Allow cell movement from the cilia due to the moving of the filaments
Cytoplasm
Fluid in a cell (cytosol)
Fills space not taken by organelles
Breaks down some large molecules with dissolved enzymes

4. Intermediate filaments
Provide mechanical support for the plasma membrane where it comes into contact with other cells or the extracellular matrix. Unlike microfilaments and microtubules, intermediate filaments do not participate in cell motility.
Intermediate filaments are found in nearly all eukaryotic cells from multicellular organisms
In epidermal cells and the axons and neurons, intermediate filaments are at least 10 times more abundant than microfilaments and microtubules.
Reinforce cells and to organize cells into tissues.

5. Microfilaments (Actin filaments)
Main Functions:
Cytokinesis
Changes in cellular shape
Endocytosis
Exocytosis
Cellular contractions
Microfilaments are thin strands of the protein actin. They transport myosin proteins whose movement helps pinch the cell from one into two. These filaments are flexible, yet still strong in order to support the cell.

6. Centrioles
Centrioles are cylindrical arrays of 9 microfilaments, which are used for motion in the cell
Constructed during the S phase of the cell cycle while DNA is being replicated
Two centrioles come together to form a part of a centrosome

7. Centrosomes
Centrosomes consist of 2 centrioles and are duplicated during the s phase of the cell cycle. During mitosis the centrosomes move to opposite sides of the cell. Spindle fibers, which are groups of microtubules, pull apart the chromosomes during anaphase, allowing the cell to duplicate.

8. References
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