Digestive Functions of Intestine::
Pancreatic Secretion:
This is the secretion from the exocrine part of the pancreas which enters into the duodenum via its pancreatic duct its pH is 7.1 to 8.2 i.e on the alkaline side this juice contains number of enzymes namely trypsinogen chymotrypsinogen carboxypeptidase aminopeptidase nuclease amylase maltase sucrase lactase lipase and esterase
Carbohydrates Digestion:: pancreatic amylase acts on starch and dextrin which are completely digested to maltose Maltase converts the maltose into glucose pancreatic amylase acts on both the starches i.e boiled and unboiled its action is more rapid than ptyalin optimum reaction range is at pH 6.7 TO 7. Salts and chloride ions are essential for its action
Fats Digestion:It is mainly carried out by pancreatic lipase (steapsin) which acts in a slightly alkaline medium (pH8) Its optimum temperature is 40C bile salts help in emulsification of fats by reducing surface tension and thus big fat molecules are converted into smaller globules thus bile facilitates the digestive action of the pancreatic lipase and the absorption of lipids
Proteins Digestion:: Trypsinogen chymotrypsinogen and procarboxypeptidase are in the form of zymogen Enterokinase activates trypsinogen into trypsin and trypsin activates chymotrypsinogen into chymotrypsin these enzymes act on proteins and their breakdown take place as follows:
proteins ------> primary proteoses ---->secondary proteoses---->peptones---->polypeptides----->low power polypeptides---->amino acids
procarboxy -polypeptidase is also activated by trypsin and carboxypolypeptidase is formed that acts on terminal aminoacid at carboxyl end of proteins to convert into peptides and aminoacids
Succus Entericus: Intestinal juice is secreted in the intestine it contains enzymes erepsin lipase amylase sucrase maltase and lactase (1) Erepsin acts on dipeptides and polypeptides and breaks them down to amino acids (2) Intestinal lipase acts on fats and converts it into fatty acids (3) Sucrase acts on sucrose maltase on maltose lactase on lactose and amylase acts on starch and finally convert them into glucose fructose and galactose
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