Question

The correctly sequenced sections of the small intestine are: ____________, _____________, ____________.

Answer 1

The correctly sequenced sections of the small intestine are the duodenum, jejunum, and ileum, going from the start near the stomach to the end connecting to the large intestine.

Step-by-step explanation:

The correctly sequenced sections of the small intestine from proximal (closest to the stomach) to distal (furthest from the stomach) are the: duodenum, jejunum, and ileum. These parts are crucial for the digestive process; where the duodenum is responsible for the initial breakdown of food, the jejunum is involved in nutrient absorption, and the ileum continues this absorption and also connects to the large intestine. Each section has a specialized lining with mucosa, villi, and microvilli that dramatically increase the surface area, enhancing the digestive and absorptive capacity of the small intestine.

Answer 2

The correct answer is: duodenum, jejunum, ileum.

Step-by-step explanation:

The small intestine is the part of the digestive tube that is mostly responsible for the absorption of nutrients that we incorporate through our diet, although part of the digestion also occurs in this segment (specifically in the duodenum).

The first segment, the duodenum, is the shortest of the three (about 25 centimeters in length) and is the one that is connected to the stomach. The duodenum receives the bile (from the liver), the pancreatic juice (from the pancreas), and the gastric chyme (from the stomach), to digest proteins and fat.

The second segment, called the jejunum, is about 2,5 meters long and its main task is to absorb the products of digestion, such as amino acids, carbohydrates, and fatty acids. This is how the nutrients reach our bloodstream and then the tissues where they are needed.

The last segment, the ileum, is the longest (about 3 meters long) and it's responsible for the absorption of vitamin B12 and bile acids. The ileum then connects to the large intestine, where water will be absorbed.