Exam 15: The Digestive System

Why is the intestinal hormone secretin released by endocrine cells in the duodenal mucosa

Pepsin formation in the stomach is autocatalytic.

Both parasympathetic and sympathetic stimulation increase salivary secretion, contrary to the usual antagonistic activity of these two components of the autonomic nervous system.

Chyme is produced in the stomach.

The enterogastric reflex and enterogastrones inhibit gastric motility but stimulate gastric secretion.

What does the pyloric gland area of the stomach antrum secrete

CCK causes relaxation of the sphincter of Oddi.

Which of these factors is the most potent stimulus for inhibition of gastric motility

Match the gastric cell types, labelled a. through d., with the correct characteristics. (Options may be used more than once or not at all.) -secrete intrinsic factor

Which of these activities occurs during the cephalic phase of gastric digestion

Indicate the site, labelled a. through e., at which digestion of each of the three main categories of foodstuffs commences and is completed. (Options may be used more than once or not at all.) -carbohydrate digestion is completed

What does pepsinogen do after it has been activated

Which of these statements does NOT apply to the digestion of polysaccharides

Sodium can be absorbed both actively and passively.

HCl activates pepsinogen.

Which of the following is NOT a component of saliva

Match the digestive secretions, labelled a. through e., to the descriptions. (Options may be used more than once or not at all.) -exerts detergent action

The contents of the digestive tract are technically outside the body.

Describe the defecation reflex.

The rate of gastric emptying is influenced by factors both in the stomach and in the duodenum.