The organelle primarily involved in cell division is the centrioles. These cylindrical structures are found in pairs within the centrosome, which is crucial for the organization of microtubules during cell division.
During mitosis, the centrioles help to form the spindle fibers that separate chromosomes, ensuring that each daughter cell receives the correct number of chromosomes. In addition to centrioles, other structures like the spindle apparatus and the nuclear envelope also play significant roles in the process, but centrioles are essential for organizing and directing the spindle fibers for effective chromosome separation.