The gastrointestinal tract, which is the long, continuous route that food takes through your digestive system, is really longest in the small intestine. Food is converted to liquid in the small intestine, where the majority of its nutrients are absorbed. The big intestine receives the waste.

Overview

Within your digestive system is the small intestine. It is a component of the gastrointestinal (GI) tract, which is the lengthy route that food travels through in your body. Food travels through the small intestine, also known as the small bowel, after it leaves your stomach. The large bowel, commonly known as the large intestine or colon, is connected to the small bowel. Food must be broken down, its nutrients absorbed, and waste solidified by the intestines. The majority of your digestion happens in the small intestine, which is the longest section of the GI tract.

small intestine

What are the different parts of the small intestine?

The small gut has a beginning segment, a center section and an stop segment. Although there may be no real separation between the elements, they do have barely specific characteristics and roles to play

Duodenum

The duodenum is the first a part of the small intestine that the stomach feeds into. It’s a short, descending chute (about 10 inches lengthy) that curves around the pancreas in a “C” shape earlier than connecting to the relaxation of the coiled intestines.

Jejunum

The remaining small gut lays in many coils inside the lower belly hollow space. Its middle phase, referred to as the jejunum, makes up a little much less than half of this ultimate period. The jejunum is characterized by using many blood vessels, which offer it a deep pink color

Ileum

The ileum is the remaining and longest section of the small gut. Here the partitions of the small gut begin to thin and slender, and blood supply is reduced. Food spends the maximum time within the ileum, in which the most water and nutrients are absorbed.

Histology

The jejunum shares the same mucosa, submucosa, muscularis, and serosa histological pattern as the entire small intestine.

Simple columnar epithelium lines the mucosa in the direction of the lumen (lamina epithelialis). Goblet cells and enterocytes are present. The crypts of Lieberkuhn and the finger-like villi that protrude into the intestinal lumen are characteristic. Deep within the crypts are cells called paneth, which are similar to duodenum.

The muscle layer (muscularis mucosae) and connective tissue layer (lamina propria) come after the epithelium layer.

Loose connective tissue, lymph nodes, blood arteries, and the Meissner’s plexus make up the submucosa.

Function

How does colorectal cancer start?​ // small intestine

What does the small intestine do?

The majority of the protracted digestive process happens in the small intestine.
It food is broken down methodically.
takes up nutrients.
draws water out.
transports food through the digestive system.

People also ask

Where is the small intestine located?

Beneath the stomach in the lower abdominal cavity is the coiled small intestine. Encircling it and defining the boundaries of the abdominal cavity is the big intestine.

What are the 3 parts of the small intestine?

The three parts of the small intestine are the duodenum, jejunum, and ileum.

What is the smallest intestine called?

The duodenum. The first section of the small intestine into which the stomach feeds is the duodenum. The pancreas is encircled by a small, descending chute (approximately 10 inches long) that forms a “C” before joining the remainder of the coiled intestines.

What does the small intestine look like?

It resembles a lengthy, multi-foiled pink or crimson tube. It has to do with your index finger’s breadth. It is “smaller” than the large intestine because of its width rather than its length.

How long is the small intestine?

At over 22 feet in length, the small intestine is by far the longest segment of the digestive system. In addition, the lining features a large surface area that is coiled into peaks and folds. The liner would completely enclose a tennis court if it were stretched out.

What is the main function of the small intestine?

It facilitates the stomach’s continued meal digestion. In order for the body to use the nutrients—vitamins, minerals, carbs, lipids, and proteins—it absorbs water from meals. The digestive system includes the small intestine.

Conditions and Disorders

What happens if the small intestine is not working properly?

Water and nutrients are absorbed from food in the small intestine. You might have watery stools (diarrhea) and nutritional deficits if these functions are compromised. The small intestine’s muscular contractions aid in the breakdown and bodily processing of meals. You can get constipation and indigestion if these movements are hindered. Small intestine inflammation can result from a number of illnesses and infections, which can include nausea, vomiting, and stomach pain.

What is the function of villi?

Villi are projections that resemble fingers and are densely packed with blood vessels. They are found in the small intestine’s inner lining and aid in nutrition absorption by expanding the surface area available for absorption.