process of gastirc secrtion

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  • The secretion of gastric juice is controlled by both nerves and hormones.

 • Three phases of gastric secretion are cephalic ,gastric and intestinal phases.

 (in human beings a 4th phase called interdigestive phase exist)

CEPHALIC PHASE

 Secretion of gastric juice by the stimuli arising from head region (cephalus) is called cephalic phase.

 • This phase is regulated by nervous mechanism.

 • The gastric juices secreted during this phase is called appetite Juice.

 • During this phase gastric secretion occur without the presence of food in the stomach.

 • Two types of reflex -unconditioned and conditioned reflex regulate cephalic phase.

GASTRIC PHASE:

Secretion of gastric juice and food into the stomach is called gastric phase.

 • This phase is regulated by both nervous and hormonal control.

 • Gastric juice is secreted during this phase is rich in pepsinogen and hydrochloric acid.

 • Gastric phase of secretion last three to four hours.

INTESTINAL PHASE

Intestinal phase is the secretion of gastric juice when chyme enters the intestine

 • Intestinal phase can be divided into initial stage of intestinal phase and later stage of intestinal phase.

 • During the initial stage of intestinal phase gastric secretion increases

 • In the later stage of intestinal phase gastric secretion is decrease or completely stoppage.

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Yo mathi ko 3ote chart ni banunu la


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