centroiles

These are part of a cell, only present in the animal cell, are paired organelles located together near the nucleus in the centrosome, which organises these centroiles. each centroile consists of 3x9 microtubules, arranged in a ring.

these play a notable role in cell division.During interphase of an animal cell, the centrioles and other components of the centrosome are duplicated, though scientists are not yet sure how this duplication takes place. At first the two pairs of centrioles remain in close proximity to each other, but as mitosis initiates, the original centrosome divides and the pairs are split up so that one set of centrioles is located in each of the new microtubule-organizing centers. These new centers radiate microtubules in star-shaped clusters known as asters. As the asters move to opposing poles of the cells, the microtubules, with the help of the centrioles, become organized into a spindle-shaped formation that spans the cell.these fibres act as guides for the alignment of the chromosone that seperate later during cell division.

Though centrioles play a role in the mitosis of animal cells, plant cells are able to reproduce without them. Researchers have, therefore, been very interested in determining exactly how important the organelles really are. Studies have shown that certain animal cells, particularly female gametes (oocytes), can successfully divide even when their centrioles are destroyed. Some investigators have also found, however, that the absence of centrioles in animal cells is associated with an increased number of divisional errors and substantial delays in the mitotic process, especially before chromosome segregation. Consequently, it has been suggested that centrioles evolved as a refinement of the cell, making mitosis a much more efficient and less error-prone process.

This is a picture of centroiles in animal cell mitosisat the top/\