Questions: 20. Empties bile into the duodenum from the gall bladder. 22. The last stretch of the large intestine before it exits at the anus. 23. Bumpy structure under the stomach; makes insulin Lies between the two umbilical vessels.

To address the questions provided:

20. The structure that empties bile into the duodenum from the gall bladder is the common bile duct. The common bile duct is responsible for transporting bile from the gall bladder and liver into the duodenum, which is the first part of the small intestine.

21. The last stretch of the large intestine before it exits at the anus is the rectum. The rectum is the final section of the large intestine, where feces are stored before being expelled through the anus.

22. The bumpy structure under the stomach that makes insulin and lies between the two umbilical vessels is the pancreas. The pancreas is an organ that produces insulin, a hormone crucial for regulating blood sugar levels, and it is located behind the stomach.

In summary:

• Question 20 refers to the common bile duct.
• Question 22 refers to the rectum.
• Question 23 refers to the pancreas.