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<big><center>[[Endocrine System - Anatomy & Physiology|'''BACK TO ENDOCRINE SYSTEM ANATOMY & PHYSIOLOGY''']]</center></big>
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The Alimentary System secretes hormones which have various functions within the Gatrointestinal tract, liver, gall bladder and pancreas.
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Various regions of the [[Alimentary System Overview - Anatomy & Physiology|Alimentary Tract]] secrete [[Hormones - Anatomy & Physiology|hormones]] which have various functions within the gastrointestinal tract itself, plus the [[Liver - Anatomy & Physiology|liver]], [[Gall Bladder - Anatomy & Physiology|gall bladder]] and [[Pancreas - Anatomy & Physiology|
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pancreas]].
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Many of the hormones act in a ''paracrine'' fashion, exerting their effect on cells close to the secretion site without travelling in the bloodstream.
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{| border="1" cellpadding="10" cellspacing="0"
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{| border="1" cellpadding="5" cellspacing="0"
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|+ ''Main hormones of the GIT''
 
!Hormone
 
!Hormone
 
!Site of Secretion within GIT
 
!Site of Secretion within GIT
 
!Action
 
!Action
 
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|<font color=red>Cholecystokinin</font>
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|<font color=Purple>Cholecystokinin</font>
|Duodenum
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|[[Duodenum - Anatomy & Physiology|Duodenum]]
|Stimulates digestion of fat and protein by causing release of digestive enzymes and bile from the [[Pancreas - Anatomy & Physiology|pancreas]] and gall bladder.
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|Stimulates digestion of fat and protein by causing release of digestive enzymes and bile from the [[Pancreas - Anatomy & Physiology|pancreas]] and [[Gall Bladder - Anatomy & Physiology|gall bladder]].
 
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|<font color=red>Gastrin</font>
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|<font color=Purple>Gastrin</font>
|G-Cells in Stomach and duodenum
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|G-Cells in [[Monogastric Stomach - Anatomy & Physiology|stomach]] and [[Duodenum - Anatomy & Physiology|duodenum]]
|Stimulates Parietal cells in the [[Forestomach - Anatomy & Physiology|stomach]] to secrete HCl and Chief cells to secrete pepsinogen.
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|Stimulates Parietal cells in the [[Monogastric Stomach - Anatomy & Physiology|stomach]] to secrete HCl and Chief cells to secrete pepsinogen.
 
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|<font color=red>Gastric Inhibitory Peptide</font>
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|<font color=Purple>Gastric Inhibitory Peptide</font>
|Duodenum and Jejunum  
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|[[Duodenum - Anatomy & Physiology|Duodenum]]and [[Jejunum - Anatomy & Physiology|Jejunum]]
|Inhibits gastric motility and HCl secretion in the [[Forestomach - Anatomy & Physiology|stomach]], induces insulin secretion.
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|Inhibits gastric motility and HCl secretion in the [[Monogastric Stomach - Anatomy & Physiology|stomach]], induces insulin secretion.
 
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|<font color=red>Ghrelin</font>
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|<font color=Purple>Ghrelin</font>
|[[Forestomach - Anatomy & Physiology|Stomach]]and [[Pancreas - Anatomy & Physiology|Pancreas]]
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|[[Monogastric Stomach - Anatomy & Physiology|Stomach]] and [[Pancreas - Anatomy & Physiology|Pancreas]]
|Increases food intake (by stimulating hunger) at the level of the hypothalamus
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|Increases food intake (by stimulating hunger) at the level of the [[Hypothalamus - Anatomy & Physiology|hypothalamus]].
 
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|<font color=red>Secretin</font>
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|<font color=Purple>Secretin</font>
|Crypts of Leiberkuhn in the Duodenum  
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|Crypts of Leiberkuhn in the [[Duodenum - Anatomy & Physiology|Duodenum]]
|Causes secretion of bicarbonate to buffer the pH of the chyme entering the small intestine. Also triggers insulin release.
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|Causes secretion of bicarbonate to buffer the pH of the chyme entering the [[Small Intestine Overview - Anatomy & Physiology|small intestine]]. Also triggers insulin release.
 
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|<font color=red>Somatostatin </font>
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|<font color=Purple>Somatostatin </font>
|Gastric glands of the stomach
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|Gastric glands of the [[Monogastric Stomach - Anatomy & Physiology|stomach]]
|Inhibits release of gastrin and HCl from the [[Forestomach - Anatomy & Physiology|stomach]], inhibits secretin and cholecystokinin release from the duodenum and inhibits release of glucagon from the [[Pancreas - Anatomy & Physiology|pancreas]].
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|Inhibits release of gastrin and HCl from the [[Monogastric Stomach - Anatomy & Physiology|stomach]], inhibits secretin and cholecystokinin release from the [[Duodenum - Anatomy & Physiology|duodenum]] and inhibits release of glucagon from the [[Pancreas - Anatomy & Physiology|pancreas]].
 
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[[Category:Endocrine System - Anatomy & Physiology]]
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[[Category:Alimentary System - Anatomy & Physiology]]
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