AP BIOLOGY

Detailed explanation-1: -The first part of the small intestine. It connects to the stomach. The duodenum helps to further digest food coming from the stomach.

Detailed explanation-2: -Duodenum. The duodenum is the first part of the small intestine that the stomach feeds into.

Detailed explanation-3: -The duodenal bulb, about 2 cm (3⁄4 in) long, is the first part of the duodenum and is slightly dilated. The duodenal bulb is a remnant of the mesoduodenum, a mesentery that suspends the organ from the posterior abdominal wall in fetal life.

Detailed explanation-4: -The second part of the duodenum (referred to as the descending portion) borders the right lateral margin of the pancreatic head, and receives the common bile and pancreatic ducts at the major papilla.

Detailed explanation-5: -A long tube-like organ that connects the stomach and the large intestine. It is about 20 feet long and folds many times to fit inside the abdomen. The small intestine has three parts: the duodenum, jejunum, and ileum. It helps to further digest food coming from the stomach.