Title: Jejunum's Function in the Small Intestine and Digestive System:
Headings: Anatomy and Function of the Digestive System
Anatomy and Function of the Digestive System
Mouth
Esophagus
Stomach
Small Intestine
Duodenum
Jejunum Function
Ileum
Large Intestine
Accessory Digestive Organs and Glands
Salivary Glands
Pancreas
Liver
Gallbladder
Digestive System Problems and Diseases
Diarrhea
Diverticular Disease
Gastroenteritis
Heartburn
Gas in the Digestive Tract
Hepatitis
Inflammatory bowel diseases
Ulcerative colitis
Crohn’s Disease
Irritable Bowel Syndrome
Lactose intolerance
Peptic Ulcers
Cancers

Content: The villi increase the surface area of the jejunum and allows much more absorption of nutrients in this part of the small intestine—most of the food absorption is done in this part of the digestive tract. Simple sugars, water soluble vitamins (except vitamin C and some Bs) and amino acids made from the food is passed from the villi into the blood stream while the fat is passed into the lymph capillaries. The rest of the food passes into the ileum. Ileum
The last part of the small intestine is mainly the pelvic region. It looks very similar to the jejunum. Also there is no specific “line” between the jejunum and the ileum. However, the nature of the small intestine gradually changes. It is thinner and has fewer blood vessels as compared to the jejunum. The last absorption of nutrients from the food takes place here—amino acids (the end products of protein digestion), fat-soluble vitamins (A, D, E, and K), fatty acids (the end products of fat digestion), cholesterol, sodium, potassium alcohol, and B12. The terminal ileum is an important part as this is where vitamin B12 is absorbed into the blood capillaries.