Final answer:
The pylorus is the narrowed distal region of the stomach that connects to the duodenum and controls the passage of food.
Step-by-step explanation:
The narrowed distal region of the stomach is called the pylorus. It is a funnel-shaped region that connects the stomach to the duodenum. The pyloric canal, the narrower end of the pylorus, is the point of connection to the duodenum and is controlled by the smooth muscle pyloric sphincter.
The pylorus regulates the passage of food from the stomach to the small intestine. It contracts to allow small amounts of partially digested food to pass through while preventing large particles from entering the small intestine.