Tuesday, May 12, 2015

Control Of Secretions


CONTROL OF SECRETION

There are three phases of secretion:

*  Cephalic
*  Gastric
*  Intestinal

The vagus nerve is the secretory nerve for cephalic phase.

Existence  of a gastropancreatic reflex set of by  distension  of
the stomach, increases the volume of enzyme output due to release
of secretin and CCK (cholecystokinin) from the duodenal mucosa.

*  Loss  of  pancreatic juice, due to total  external  pancreatic
   fistula results in impairment of the digestion and absorption,
   particularly of fat

*  Loss of fat in the stool occurs in patients in whom pancreatic
   juice is completely excluded from the intestines resulting  in
   steatorrhea

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