By which control is the control of the actions occurring while going into the small part of the small intestine from the stomach?

The control of the actions occurring while the contents move from the stomach into the small intestine, specifically into the duodenum (the first part of the small intestine), is regulated by the pyloric sphincter. The pyloric sphincter is a ring of smooth muscle at the junction between the stomach and the duodenum that controls the passage of partially digested food (chyme) from the stomach into the small intestine. It ensures that the chyme is released in a controlled and gradual manner, allowing for proper digestion and absorption in the small intestine.