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| + | <big><center>[[Endocrine System - Anatomy & Physiology|'''BACK TO ENDOCRINE SYSTEM ANATOMY & PHYSIOLOGY''']]</center></big> |
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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="5" cellspacing="0"
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| − | |+ ''Main hormones of the GIT''
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| − | !Hormone
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| − | !Site of Secretion within GIT
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| − | !Action
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| − | |<font color=Purple>Cholecystokinin</font>
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| − | |[[Duodenum - Anatomy & Physiology|Duodenum]]
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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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| − | |-
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| − | |<font color=Purple>Gastrin</font>
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| − | |G-Cells in [[Monogastric Stomach - Anatomy & Physiology|stomach]] and [[Duodenum - Anatomy & Physiology|duodenum]]
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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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| − | |-
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| − | |<font color=Purple>Gastric Inhibitory Peptide</font>
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| − | |[[Duodenum - Anatomy & Physiology|Duodenum]]and [[Jejunum - Anatomy & Physiology|Jejunum]]
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| − | |Inhibits gastric motility and HCl secretion in the [[Monogastric Stomach - Anatomy & Physiology|stomach]], induces insulin secretion.
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| − | |-
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| − | |<font color=Purple>Ghrelin</font>
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| − | |[[Monogastric Stomach - Anatomy & Physiology|Stomach]] and [[Pancreas - Anatomy & Physiology|Pancreas]]
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| − | |Increases food intake (by stimulating hunger) at the level of the [[Hypothalamus - Anatomy & Physiology|hypothalamus]].
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| − | |-
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| − | |<font color=Purple>Secretin</font>
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| − | |Crypts of Leiberkuhn in the [[Duodenum - Anatomy & Physiology|Duodenum]]
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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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| − | |-
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| − | |<font color=Purple>Somatostatin </font>
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| − | |Gastric glands of the [[Monogastric Stomach - Anatomy & Physiology|stomach]]
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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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| − | |}
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| − | {{OpenPages}}
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| − | [[Category:Endocrine System - Anatomy & Physiology]]
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| − | [[Category:Alimentary System - Anatomy & Physiology]]
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