Unit 3 Gastrointestinal Physiology, Gastric Secretions, Enteroendocrine Hormones, Parietal & Chief Cells, Mucosa, Muscularis Externa, Serosa, Circular Folds, Villi, Microvilli, Peyer’s Patches, Submucosal Plexus, Myenteric Plexus, Short & Long Reflexes, G

Unit 3 Gastrointestinal Physiology, Gastric Secretions, Enteroendocrine Hormones, Parietal & Chief Cells, Mucosa, Muscularis Externa, Serosa, Circular Folds, Villi, Microvilli, Peyer’s Patches, Submucosal Plexus, Myenteric Plexus, Short & Long Reflexes, Gastrin, Secretin, Cholecystokinin, GIP, HCl, Pepsinogen, Intrinsic Factor, Bile Secretion, Pancreatic Enzymes, Hepatopancreatic Ampulla, Lipid Emulsification, Micelles, Chylomicrons, Gastric Phases, Intestinal Motility, Retroperitoneal Organs, Teniae Coli, Segmentation, Digestive Processes, GI Receptors, and Proton Pump Inhibitors Exam Questions V erified and Provided with Complete A+ Graded Rationales Latest Updated 2026 Proton-pump inhibitors are drugs that block the secretions of gastric acids. Which cells are affected by these drugs? mucous neck cells diffuse neuroendocrine system (DNES) cells chief cells parietal cells parietal cells A patient presents with gastric acid hypersecretion. It can be explained by an increase in the plasma concentration of which of the following? secretin gastric inhibitory peptide (GIP) gastrin somatostatin gastrin What is a unique feature of the stomach histology compared to the typical histology of the GI tract? muscularis externa has 3 layers of smooth muscle instead of just 2 like the rest of system which phase of gastric secretion begins as chyme enters the duodenum. intestinal phase What constitutes a portal triad? a bile duct, portal venule, & portal arteriole Which of the following is paired incorrectly? pancreatic lipase - digests lipids trypsin - digest peptides CCK - inhibits gastric emptying pepsin - stimulates release of bile pepsin - stimulates release of bile Which layer of the digestive tract contains the effectors for digestive propulsion? serosa muscularis externa mucosa submucosa muscularis externa Bile salts break up the fat globule into smaller fat droplets. This role of bile salts is best described as ________. lipid digestion lipid ingestion lipid emulsification lipid absorption lipid emulsification What structural modification of the small intestine slows the movement of chyme through the lumen? circular folds The three longitudinal strips of the muscularis externa found in the colon are the teniae coli From the esophagus to the anus, the walls of the alimentary canal have the same four basic tunics. The __________ is the outermost layer of the walls of the intraperitoneal organs. serosa (aka visceral peritoneum)