Chapter 25

Which of the following occurs during the gastric phase of gastric secretion? All of these take place in the gastric phase. None of these take place in the gastric phase. Gastrin secretion begins. Gastric activity is stimulated in response to food increasing the pH of the stomach's contents. The secretion of hydrochloric acid and pepsin is stimulated.

All of these take place in the gastric phase.

Match each gastric mucosal cell with its function. Mucous cells Regenerative cells Parietal cells Chief cells Enteroendocrine cells A. Secrete digestive enzyme gastric lipase and pepsinogen B. Secrete mucus and predominate in the cardia and pylorus C. Divide rapidly and supply and continuous supply of new cells D. Secret hydrochloric acid, intrinsic factor, and ghrelin E. Secrete hormones and paracrine messengers

B, C, D, A, E

In order for digestion to occur, chyme is required to contact the microvilli of the intenstinal wall because the _________. brush border enzymes remain inside the epithelial cells of the small intenstine intenstinal pits between microvilli absorb the chyme's components microvilli are stimulated by mechanically gated receptors microvilli utilize mechanical digestion to break down chyme brush borders enzymes are not secreted into the lumen

brush borders enzymes are not secreted into the lumen

In the parietal cells, the enzyme carbonic anhydrase causes a reaction between ____________ and ______________. carbon dioxide; water bicarbonate ions; hydrogen ions hydrogen ions; chloride ions carbonic acid; water hydrogen ions; potassium ions

Carbon dioxide, water

Which of the following inhibits the secretion of the gastric glands? Duodenal pH of less than two Duodenal pH above 2 Presence of chyme in the stomach Gastrin Lipids in the stomach

Duodenal pH of less than two

As long as there is chyme in the duodenum, it will continue to stimulate gastric secretion. True False

False

Which of the following hormones does not inhibit gastric gland secretion? Secretin Gastric inhibitory peptide Cholecystokinin Gastrin

Gastrin

Which of the following enzymes is produced in the stomach? Chymotrypsin Insulin Secretin Trypsin Pepsin

Pepsin

Gastrin functions to increase the production of HCL in the stomach. True False

True

Secretin is released from the duodenum in response to ______. the hormone gastrin partially digested protein partially digested carbohydrate sodium hydroxide in chyme hydrochloric acid in chyme

hydrochloric acid in chyme