Small intestine (2)


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Small intestine (2)

  1. 1. Axel Lau Jerry Tan Noel Kwan Bryan Lim Nigel Tan Pang Yong Ray Edwin Lim
  2. 2. Brief Description <ul><li>Absorbs nutrients and digests the food we eat </li></ul><ul><li>The small intestine in an adult human measures on average 6 meters and is 2.5-3 meters wide. </li></ul><ul><li>It is divided into three structural parts: </li></ul><ul><li>-Duodenum </li></ul><ul><li>-Jejunum </li></ul><ul><li>-Iluem </li></ul>
  3. 3. Digestion <ul><li>Digestive enzymes are secreted from the pancreas which are used to digest food </li></ul><ul><li>Proteins degrade into amino acids which are then split by enzymes. </li></ul><ul><li>Fats are degraded into fatty acids and glycerol. </li></ul><ul><li>Some carbohydrates are degraded into simple sugars while other carbohydrates pass undigested into the large intestine and further handling by intestinal bacterial. </li></ul>
  4. 4. Absorption <ul><li>The digested food come into contact with the many small blood vessels which surround the small intestine. </li></ul><ul><li>This blood then leaves the small intestine, carrying away nutrients, water electrolytes, vitamins, minerals, fats and medications to the entire body. </li></ul><ul><li>It can take 3-6 hours for a meal to pass through the small intestine. </li></ul>
  5. 5. Duodenum <ul><li>A hollow jointed tube about 10–12 inch long connecting the stomach to the jejunum. </li></ul><ul><li>The duodenum is responsible for the breakdown of food in the small intestine, using enzymes. </li></ul><ul><li>Brunner's glands, which secrete mucus, are found in here. </li></ul><ul><li>It also regulates the rate of emptying of the stomach via hormonal pathways. </li></ul>
  6. 6. Jejunum <ul><li>The inner surface of the jejunum is covered with villi, which increase the surface area of tissue available to absorb nutrients from the digested food. </li></ul><ul><li>Once the food is soaked into the villi, they are transported by the blood stream to the rest of the body. </li></ul><ul><li>The transport of nutrients includes the transport of sugar fructose, amino acids, small peptides, vitamins and glucose. </li></ul>
  7. 7. Ileum <ul><li>The function of the ileum is mainly to absorb products of digestion that were not absorbed by the jejunum. </li></ul><ul><li>The wall of the ileum is made up of folds, each of which has many villi on its surface. </li></ul><ul><li>The ileum has an extremely large surface area both for the adsorption (attachment) of enzymes and for the absorption of products of digestion. </li></ul><ul><li>Undigested food are sent to the colon. </li></ul>
  8. 8. Various diseases <ul><li>Intestinal cancer </li></ul><ul><li>Small intestinal bacterial overgrowth </li></ul><ul><li>Celliac disease </li></ul><ul><li>Irritable bowel syndrome </li></ul>
  9. 9. Quiz <ul><li>How long is the small intestine? </li></ul><ul><li>What do proteins turn into after digestion? </li></ul><ul><li>What is the function of the ileum? </li></ul><ul><li>What is the function of Brunner’s glands and where are they found? </li></ul><ul><li>How long does a meal take to pass through the small intestine? </li></ul>
  10. 10. Thank You!