Control Of The Gut - Hormones Flashcards
(20 cards)
Examples of endocrine hormones that take effect on the GI system
Gastrin
Cholecystokinin
Secretin
Paracrine hormones that take effect on the GI system
Somatostatin
Neurocrine hormones that take effect on the GI system
Gastrin releasing peptide ( GRP )
Where are endocrine and paracrine hormones released from
Enteroendocrine cells
Which hormones are in the gastrin family
Gastrin
Cholecystokinin
Which hormones are in the secretin family
Secretin
Gastrin inhibitory peptide ( GIP )
Which cells produce gastrin
G cells in the antrum of the stomach
What does gastrin do
Increases secretion of gastric acid
When is gastrin secreted
It is stimulated by the breakdown of proteins in the stomach, the vagus nerve and by stretch receptors in the stomach
Which cells produce cholecystokinin
I cells in the duodenum and jejunum
What does cholecystokinin do
Increases pancreatic / gall bladder secretions
Causes gall bladder to contract
Stimulates pancreas
When is cholecystokinin produced
Stimulated by fat and protein
Which cells produce secretin
S cells in the duodenum
What stimulated production of secretin
Hydrogen ions and fatty acids
What does secretin do
Increases HCO3 from pancreas and gall bladder
Decreases gastric acid secretion
Where is GIP produced
Cells in the duodenum and jejunum
What stimulates production of GIP
Sugars, amino acids and fatty acids
What does GIP do
Increases insulin
Decreases gastric acid secretions
What does somatostatin do
Deactivates G cells
Decreases gastric acid secretions
What stimulates somatostatin production
A drop in pH
