Changes

The Alimentary System secretes hormones which have various functions within the Gatrointestinal tract, liver, gall bladder and pancreas.

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|

pancreas]].

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!Hormone

!Hormone

!Site of Secretion within GIT

!Site of Secretion within GIT

!Action

!Action

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|<font color=red>Cholecystokinin</font>

|<font color=Purple>Cholecystokinin</font>

|Duodenum

|[[Duodenum - Anatomy & Physiology|Duodenum]]

|Stimulates digestion of fat and protein by causing release of digestive enzymes and bile from the pancreas and gall bladder.

|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>

|<font color=Purple>Gastrin</font>

|G-Cells in Stomach and duodenum

|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.

|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>

|<font color=Purple>Gastric Inhibitory Peptide</font>

|Duodenum and Jejunum  

|[[Duodenum - Anatomy & Physiology|Duodenum]]and [[Jejunum - Anatomy & Physiology|Jejunum]]

|Inhibits gastric motility and HCl secretion in the [[Forestomach - Anatomy & Physiology|stomach]], induces insulin secretion.

|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>

|<font color=Purple>Ghrelin</font>

|[[Forestomach - Anatomy & Physiology|Stomach]]and Pancreas

|[[Monogastric Stomach - Anatomy & Physiology|Stomach]] and [[Pancreas - Anatomy & Physiology|Pancreas]]

|Increases food intake (by stimulating hunger) at the level of the hypothalamus

|Increases food intake (by stimulating hunger) at the level of the [[Hypothalamus - Anatomy & Physiology|hypothalamus]].

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|<font color=red>Secretin</font>

|<font color=Purple>Secretin</font>

|Crypts of Leiberkuhn in the Duodenum  

|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.

|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>

|<font color=Purple>Somatostatin </font>

|Gastric glands of the stomach

|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.

|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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