What does each part of the small intestine do?

Asked By: Virtud Vanderfuhr | Last Updated: 18th February, 2020
Category: medical health digestive disorders
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The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals from food.

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Considering this, what are the functions of the 3 parts of the small intestine?

It lies between the stomach and large intestine, and receives bile and pancreatic juice through the pancreatic duct to aid in digestion. The small intestine has three distinct regions – the duodenum, jejunum, and ileum.

Similarly, what is the work of small intestine? The intestines are a long, continuous tube running from the stomach to the anus. Most absorption of nutrients and water happen in the intestines. Its job is to absorb most of the nutrients from what we eat and drink. Velvety tissue lines the small intestine, which is divided into the duodenum, jejunum, and ileum.

Also Know, what are the parts of the small intestine?

small intestine: The upper part of the intestine, between the stomach and the large intestine, that is divided into the duodenum, the jejunum, and the ileum. jejunum: The central of the three divisions of the small intestine that lies between the duodenum and the ileum.

How long is each part of the small intestine?

The length of the small intestine can vary between about 10 feet (3 meters) to over 16 feet (5 meters). For comparison, a standard basketball hoop is 10 feet tall. The different sections of the small intestine are also different lengths. The ileum is the longest section while the duodenum is the shortest.

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Can you live without a small intestine?

Intestinal Failure
Most people can live without a stomach or large intestine, but it is harder to live without a small intestine. When all or most of the small intestine has to be removed or stops working, nutrients must be put directly into the blood stream (intravenous or IV) in liquid form.

What is the pH of the small intestine?

The pH gradually increases in the small intestine from pH 6 to about pH 7.4 in the terminal ileum. The pH drops to 5.7 in the caecum, but again gradually increases, reaching pH 6.7 in the rectum.

How long does it take for food to pass through the small intestine?

After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food.

How do you check the small intestine?

Upper endoscopy (EGD) is a test that enables the physician to look inside the duodenum (first part of the small intestine), as well as the esophagus and stomach. For the procedure a thin, flexible, lighted tube called an endoscope swallowed.

What part of the small intestine is closest to the stomach?


The duodenum connects the stomach to the small intestine.

What are symptoms of small intestine problems?

What are common symptoms of bowel disorders?
  • discomfort or pain in your abdomen.
  • gas and abdominal bloating.
  • nausea.
  • diarrhea.
  • constipation.
  • vomiting.

What happens when the food goes to the small intestine?

The small intestine absorbs most digested food molecules, as well as water and minerals, and passes them on to other parts of the body for storage or further chemical change. Specialized cells help absorbed materials cross the intestinal lining into the bloodstream.

Where in the small intestine does most absorption occur?

Absorption of the majority of nutrients takes place in the jejunum, with the following notable exceptions:
  • Iron is absorbed in the duodenum.
  • Vitamin B12 and bile salts are absorbed in the terminal ileum.
  • Water and lipids are absorbed by passive diffusion throughout the small intestine.

Can you live without an ileum?

If more than about 3 feet (about 1 meter) of ileum is removed, the remaining small intestine usually cannot adapt. Before adaptation occurs, or if it does not, the intestines have difficulty absorbing many nutrients, including fats, proteins, and vitamins.

What part of the small intestine is the longest?


Ileum: This last section is the longest part of your small intestine. The ileum is where most of the nutrients from your food are absorbed before emptying into the large intestine.

What does food look like in the small intestine?

The lining of the small intestine is covered with tiny finger-like projections called villi. They look almost like carpet. The villi help the nutrients in food to be absorbed into the blood. The villi are carpet-like fingers inside the small intestine that help absorb nutrients.

What causes pain in the small intestine?

Abdominal pain can be caused by many conditions. However, the main causes are infection, abnormal growths, inflammation, obstruction (blockage), and intestinal disorders. Infections in the throat, intestines, and blood can cause bacteria to enter your digestive tract, resulting in abdominal pain.

How can I strengthen my small intestine?

Seven steps to optimal digestive health
  1. Eat whole, unprocessed foods.
  2. Eliminate food allergies.
  3. Treat any infections or overgrowth of bugs.
  4. Replenish your digestive enzymes.
  5. Rebuild your rain forest of friendly bacteria.
  6. Get good fat.
  7. Heal your gut lining.

Why small intestine is so long?

The small intestine is so long because it needs a maximum amount of surface area to increase digestion and nutrient absorption.

What enzymes does the small intestine produce?


The small intestine produces amylase, lipase and protease. The pancreas, a pistol shaped organ, produces the enzymes amylase, lipase and protease and releases them into the small intestine when needed.

Where does Chyme go when it leaves the small intestine?

Chyme: the name given to the partially digested food that leaves the stomach via the pyloric valve into the small intestine (duodenum). Chyme, also known as chymus has the consistency of oatmeal.