ANPS20 Lab #6

T/F: The enzyme carbonic anhydrase catalyzes the formation of bicarbonate from carbon dioxide and hydrogen.

False; carbonic anhydrase catalyzes the reversible reaction between carbon dioxide and water to form carbonic acid.

A portal triad consists of which three elements? A. branches of a hepatic artery, hepatic vein, and bile duct B. branches of a hepatic artery, central vein, and bile duct C. branches of the hepatic artery, hepatic portal vein, and hepatic nerve D. branches of the porta hepatis and bile duct

A.

Which of the following might stimulate the cephalic phase of gastric secretion? A. stomach distention B. the production of saliva C. the thought of food D. the production and secretion of gastrin

C.

________ ions are actively transported into the gastric gland duct, in exchange for ________ ions which enter the parietal cells. A. potassium; hydrogen B. potassium; chloride C. hydrogen; potassium D. hydrogen; chloride E. chloride; potassium

C.

Hydrochloric acid is formed when: A. hydrogen ions and chloride ions join in the parietal cell cytoplasm B. hydrogen ions and chloride ions join in the parietal cell nucleus C. hydrogen ions and chloride ions join in the stomach lumen D. hydrogen ions and chloride ions join in the duct of the gastric gland

D.

The hydrogen ions used to form hydrochloric acid in the stomach are derived from A. chloric acid B. citric acid C. carboxylic acid D. carbonic acid E. carbalcoholic acid

D.

Which of the following does NOT stimulate the secretion of HCl in the stomach? A. smell of food B. taste of food C. distention of the stomach as it fills with food D. secretin

D.

T/F: The carbonic acid ion is joined to a hydrogen ion by the enzyme carbonic anhydrase.

False; carbonic anhydrase performs the reversible reaction between bicarbonate ion and hydrogen ion to form carbonic acid

T/F: the liver lobule is the same as a hepatocyte.

False; hepatocyte is a liver cell and a liver lobule is a functional unit composed of many individual cells.

T/F: gastric secretion is increased in all three phases (cephalic, gastric, intestinal)

False; intestinal phase inhibits gastric secretion

T/F: when chyme enters the duodenum, gastric secretion increases.

False; when chyme enters the duodenum, stretch reflexes and hormones inhibit gastric secretion

Secretin is released from the duodenum in response to: A. hydrochloric acid in chyme B. sodium hydroxide in chyme C. the hormone gastrin D. partially digested protein E. partially digested carbohydrate

A.

The ion exchange protein in the plasma membrane of parietal cells exchanges ________ ions going out for ________ ions coming in. A. bicarbonate; chloride B. bicarbonate; potassium C. bicarbonate; hydrogen D. potassium; bicarbonate E. chloride; bicarbonate

A.

Which phase(s) of gastric secretion is (are) regulated by the medulla oblongata? A. all three phases are regulated by the medulla oblongata B. only the cephalic and intestinal phases are regulated by the medulla oblongata C. only the cephalic and gastric phases are regulated by the medulla oblongata D. only the cephalic phase is regulated by the medulla oblongata.

A.

Structurally, the human liver is divided into how many lobes? A. three B. four C. two D. five

B.

Gastric secretion during the intestinal phase is inhibited by the A. presence of proteins or low pH B. presence of lipids or high pH C. presence of lipids or low pH D. presence of proteins or high pH

C.

In the parietal cells, the enzyme carbonic anhydrase causes a reaction between A. carbon dioxide and water B. carbonic acid and water C. bicarbonate ions and hydrogen ions D. hydrogen ions and potassium ions E> hydrogen ions and chloride ions

C.

Which of the following enzymes is produced by the stomach? A. insulin B. secretin C. pepsin D. trypsin E. chymotrypsin

C.

T/F: In the parietal cell, carbonic acid dissociates into a bicarbonate ion and a hydrogen ion

True

T/F: gastrin functions to increase the production of HCl in the stomach

True