Answer:
Parasympathetic division of the autonomic nervous system.
Step-by-step explanation:
This movement of the stomach is called peristaltic movement.
Peristaltic movements are involuntary rhythmic movements that occur thanks to commands from our nervous system, more precisely the autonomic nervous system. This portion of the nervous system is responsible for commanding the internal actions of our body, such as the heart rate and secretion of some glands, and of course the control of the stomach muscles.
The autonomic nervous system is divided into two distinct parts: the sympathetic nervous system and the parasympathetic nervous system. Normally, while one stimulates the action of one organ, the other causes its inhibition. In the case of peristaltic movements, the parasympathetic increases the movement, while the sympathetic causes the inhibition of the movements.