The small intestine is continuous with the stomach at
the pyloric sphincter and leads into the large intestine. Chemical digestion of
food is complete in the intestine and most absorption take place in the small
intestine. The small intestine comprises of the following section.
the pyloric sphincter and leads into the large intestine. Chemical digestion of
food is complete in the intestine and most absorption take place in the small
intestine. The small intestine comprises of the following section.
1)
Duodenium
Duodenium
2)
Jejunum
Jejunum
3)
Ileum.
Ileum.
Functions of the small intestine:
1. Onward movement of contents produced by peristaltic movement
2. Completion of digestion of carbohydrates, proteins and fats
in the entrocytes of villi.
in the entrocytes of villi.
3. Protection against infection by microbes
4. Secretion of hormones cholecystokinin (CCK) and secretin.
5. Absorption of Nutrient materials
Digestion in the small intestine:
Acid chime is mixed with
pancreatic juice, bile and intestinal juice. These complete digestion of all
nutrients. Pareneatic Juice- this consists of water mineral salt, enzymes acts
most effectively at PH 6-8 .Trypsinogen and chymotypsinogen which are inactive
enzymes are activated by enteropetidase which convert them into active
proteclytic enzymes trypsin and chymotypsin which converts polypeptides into
triptides, dipeptides and amino acids.
pancreatic juice, bile and intestinal juice. These complete digestion of all
nutrients. Pareneatic Juice- this consists of water mineral salt, enzymes acts
most effectively at PH 6-8 .Trypsinogen and chymotypsinogen which are inactive
enzymes are activated by enteropetidase which convert them into active
proteclytic enzymes trypsin and chymotypsin which converts polypeptides into
triptides, dipeptides and amino acids.
