how do they each function?
2007-12-21 03:39:48 · 3 answers · asked by S i r i 1 in Education & Reference ➔ Preschool
.the duodenum is the first part of the small intestine . Shortest part, it is responsible for the break down of food.
the jejunum is the second part. Responsible for absorption.
2007-12-21 04:35:23 · answer #1 · answered by Sunshine 6 · 0⤊ 0⤋
The duodenum begins just beyond the stomach and curves around the head of the pancreas and the entrance of the common bile duct, in a C-shaped formation. At the spot where the stomach and duodenum meet, is a muscle called the pyloric sphincter which prevents the regurgitation of material back into the stomach. The duodenum is responsible for further processing the material from the stomach (called chyme), by secreting enzymes which aid in digestion. Bile and pancreatic juice also enter the duodenum around its midpoint, and by moving the chyme in a shaking kind of motion, the duodenum mixes the chyme with these enzymes within its lumen, further aiding digestion.
The jejunum is the next portion of the small intestine, and it has a lining which is specialized in the absorption of carbohydrates and proteins. The proteins have been broken down in the stomach by enzymes called pepsin and acid into amino acids. The carbohydrates are broken down in the duodenum by enzymes from the pancreas and liver into sugars. Fats are broken down in the duodenum by "lipase" from the pancreas into fatty acids. Amino acid, sugar, fatty acid particles, vitamins, minerals, electrolytes and water are small enough to soak into the villi of the jejunum and drop into the blood stream. The blood takes all these nutrients to all the other parts of the body to provide fuel to do their jobs.
2007-12-21 05:43:24 · answer #2 · answered by I love my pug! 2 · 0⤊ 0⤋
I don't think this question is in the right place. It does not have anything to do with preschool.
2007-12-21 17:05:45 · answer #3 · answered by treebird 6 · 0⤊ 0⤋