The
answer is ‘they create tension by pulling toward opposite poles’. Kinetochores change
between persistent phases of movement towards the pole (poleward) or inversed
(anti-poleward), which are coupled with alternating states of kMTs (kinetochore
microtubules) depolymerization and polymerization, respectively. A low tension
at kinetochores promotes change towards kMTs depolymerization, and high tension
promotes change towards kMTs polymerization.