The digestive system breaks own food and transports materials. how are the short length and slow movement of smooth muscle tissues in the stomach and intestines related to the functions of these organs?

Slow Movement muscles of Stomach:-
These are helpful in a process called churning. This kind of mixes the gastric juice with the food and the movement also plays a role in converting the bolus into Chyme.
Short length and slow.movement of muscles of intestines also help in the same way as they mix the secretions in the intestines (such as bile and pancreatic juice) with the food.