Answer :
Final answer:
The major duodenal papilla is the structure within the duodenum wall through which bile and pancreatic juice enter the duodenum, controlled by the hepatopancreatic sphincter.
Explanation:
Within the wall of the duodenum is the major duodenal papilla through which bile and pancreatic juice enter the duodenum.
The duodenum receives partially digested chyme from the stomach and mixing it with bile from the liver, and digestive enzymes and bicarbonate from the pancreas.
The bile and enzymes assist in the digestion of lipids and breakdown of food particles into absorbable units like glucose, triglycerides, and amino acids.
The hepatopancreatic ampulla (also known as the ampulla of Vater) is a bulb-like point in the duodenal wall where the bile duct and the main pancreatic duct unite.
This ampulla opens into the duodenum at the major duodenal papilla. The hepatopancreatic sphincter (sphincter of Oddi) regulates the flow of both bile and pancreatic juice from the ampulla into the duodenum.