Nurs 487 - Week 9 – Gastrointestinal Exam | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+

GI tract : - Major function is mechanical and chemical breakdown of food - Absorption of nutrients The wall of the GI tract is made up of how many layers? : 4 layers 2 | P a g e - Mucosa - Muscularis - Submucosa - Serosa peritoneum : membrane that lines the abdominal cavity - Visceral layer that covers organs Amylase : Enzyme in saliva that breaks the chemical bonds in starches Peristalsis 3 | P a g e : Involuntary waves of muscle contraction that keep food moving along in one direction through the digestive system. Chyme : Partially digested, semiliquid food mixed with digestive enzymes and acids in the stomach. - Presence of chyme in SI stimulates the liver and gallbladder to deliver bile, and the pancreas to deliver digestive enzymes Bile : A substance produced by the liver that breaks up fat particles. - Necessary for fat digestion and absorption Gastrin : Digestive hormone that stimulates sustained secretion of gastric juice from the stomach secretin and cholecystokinin : - stimulate secretion by both pancreas and liver - Delay gastric emptying Three phases of acid secretion in the stomac