Digestive System Quiz

When part of the stomach extends through the diaphragm into the thoracic cavity, the condition is known as

• esophagitis.

• an ulcer.

• a hiatal hernia.

• pyloric stenosis.

Reflux of the gastric contents into the esophagus occurs because of

• relaxation of the cardiac sphincter.

• contraction of the phyloric sphincter.

• spasms of the submucosal layer of the stomach wall.

• increased hydrochloric acid production by the parietal cells.

The cephalic phase of gastric secretion

• decreases the release of gastrin on the stomach.

• is triggered by taste, thought, smell or food.

• is mediated by impulse on sympathetic nerves.

• leads to the greatest volume of gastric secretion.

The enterogastric reflex can be triggered by

• distension of the duodenal wall.

• the presence of irritating substances in the duodenum.

• increased pH in the duodenum.

• both A and B.

Gastrocolic reflexes are reflexes that

• empty the stomach.

• release gastric secretions into the stomach.

• cause mass movements of the colon when food is present in the stomach.

• lead to mass movements of the colon in response to food in the duodenum.

The defecation reflex

• is stimulated by distention of the rectum.

• inhibits further peristalsis in the rectum and lower colon.

• constricts the internal anal sphincter.

• lasts several hours

The following are functions of the liver EXCEPT

• synthesis and secretion of bile.

• antibody production.

• synthesis of plasma proteins.

• inactivation of toxins.

Chemical digestion of protein begins in the

• mouth.

• esophagus.

• stomach.

• small intestine.

• colon.

Bile is secreted by the

• liver.

• pancreas.

• stomach.

• small intestine.

• colon.

Absorption of digested food takes place mainly through

• villi in the lining of the small intestine.

• gastric glands in the wall of the stomach.

• rugae.

• lymph vessels in the stomach.

• haustra of the colon.