Chapter 23 Questions
Which of these statements about reflexes in the GI tract is false?
Food that distends the stomach initiates long reflexes.
Which of these statements about the pharynx is true?
The oropharynx is continuous superiorly with the nasopharynx
Which of these statements about bile is true?
bile salts are recycled
Which of the following stimuli activates sensors in the walls of digestive organs?
breakdown of products of digestion, dissension, and pH of chyme
Pancreatic juice ________.
buffers chyme
Which part of the large intestine attaches to the appendix?
cecum
Which of these ingredients in saliva is responsible for activating salivary amylase?
chloride ions
Which of these cells secrete hormones?
enteroendocrine cells
Which structure is located where the esophagus penetrates the diaphragm?
esophageal hiatus
Which phase of deglutition involves contraction of the longitudinal muscle layer of the muscularis?
esophageal phase
Which of the following organs is supported by a layer of adventitia rather than serosa?
esophagus
Where does the majority of chemical digestion in the stomach occur?
fundus and body
Parietal cells secrete ________.
hydrochloric acid
Which of these processes occurs in the mouth?
ingestion, mechanical digestion and chemical digestion
Which of these nutrients is absorbed mainly in the duodenum?
iron
Which of these is most associated with villi?
lacteals
Where does the chemical digestion of starch begin?
mouth
Which of these organs is not considered an accessory digestive structure?
mouth
Where are most fat-digesting enzymes produced?
pancreas
What is the role of the small intestine's MALT?
preventing bacteria from entering the bloodstream
Which of these processes occurs throughout most of the alimentary canal?
propulsion
In which part of the alimentary canal does most digestion occur?
proximal small intestine
During gastric emptying, chyme is released into the duodenum through the ________.
pyloric sphincter
Which of these is involved in the chemical digestion of protein?
trypsin
Which of the following membranes covers the stomach?
visceral peritoneum
