Stimulus is still goin to be something pushing homeostasis out of range. But for this one, it actually amplifies the stimulus until the whole system turns off. So what i'll do is i'll tell the uterus to contract more. I'll release a particular hormone called oxitosen that goes into the blood. And so if the uterus contracts more, it puts more stimulus on the servix,. which stretches the receptor more and sends more afperent signals to the control center. This keeps amplifying, amplifyend this why the waves of contraction increase more forcefully shorter time periods.