During cell division, which structures on the chromosome attaches to the spindle fibers?

The kinetochore is a complex protein structure that forms on the centromere region of the chromosome during cell division. The kinetochore binds to the microtubules of the spindle apparatus, allowing the chromosomes to be separated and ensuring that each daughter cell receives a complete set of chromosomes. The centrosome is an organelle that produces the spindle fibers, while the centriole is a component of the centrosome that helps to organize the spindle fibers. The secondary constriction is a region of the chromosome that is structurally different from the rest of the chromosome.