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Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
Small intestine (2)
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Small intestine (2)


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