Digestion Flashcards
Short reflex
Stretching of stomach and duodenum leads to secretions
Chemoreceptors= higher ph =chyme
Long reflex
A neural control that consciously stimulates
Leads to HCl production
Gastroileal reflex
Gastrin
Histamine
Acetylcholine
HCl secretion
The more hormones= the more HCl
Cholecystokinin (cck)
In the intestinal phase of digestion
Gastric inhibitory peptide
Released by the presence of acid carbs and lipids
Inhibits stomach movement and allows sphincter to open
Enters blood stream
Causes release of pancreatic juices
Secretin
Stimulates bile production
Pancreatic juice
Pepsiogenogen
Intestinal juice secretion
Inhibits stomach churning
Endorphins
Serotonin
Somatostatin
Secreted by cells in gastric pits with cck and gastric and secretin into mucosa and BLOOD. Not into stomach
Gastric inhibitory peptide
From duodenal cells
Inhibit stomach churning
HCl
From parietal cells
Pepsinogen
From chief cells
Pancreas and duodenum
Lipase and bike salts
Trypsin and trypsinogen
Pancreatic Amylase
Cephalic phase
First
Neural via vagus nerve
Sight thought smell
Increases gastric juices
Gastric phase
Second phase
Neural short reflex-stomach filling and chemoreceptors sending increase ph
Endocrine: releases gastrin
Peptides are active
Intestinal phase
Third
Controls chyme into duodenum
Neural short-duodenum stretching
Endocrine-cck and gip and secretin
Lipids and carbs
Reduced stomach churning
Salivary amylase
Mouth
Breaks down starch/carbs/sugars
Pepsin
Originally Pepsinogen- converted by HCl
Breaks down proteins
