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What are they?
    Centrioles are tubelike structures that aid in cell division. They generally are found close to the nucleus and are made up of nine tube-like structures that each have three tubules.

What do they do?
    There are two main functions of centrioles that we will focus on.
1. Cell division
    The main function of the centriole is to help with cell division in animal cells.  The centrioles help in the formation of the spindle fibers that separate the chromosomes during cell division (mitosis).
This occurs during the anaphase stage of mitosis in which the chromosomes move towards the different poles of the cell.  Without centriole's, the chromosomes would not be able to move.  In the picture above you can see the chromosomes moving to the opposite poles and also the spindle fibers(the lines). 

2. Celiogenesis
    The second function of centrioles that we will focus on is celiogenesis.  Celiogenesis is simply the formation of cilia and flagella on the surface of cells.  Cilia and flagella help the cell move. 
The picture on the right shows the cilia that form on the outside of the cell.  The cilia in this picture are bright green.  The picture below shows cells with flagella. As you can see cells can have more than one flagella.