Digestive System Physiology Lab

The hydrogen ions used to form hydrochloric acid in the stomach are derived from

Carbonic Acid

Gastric secretion is increased in all three phases (cephalic, gastric, intestinal).

False, only Cephalic

Structurally, the human liver is divided into how many lobes?

4

Which phase(s) of gastric secretion is (are) regulated by the medulla oblongata?

All three phases are regulated by the Medulla Oblongata.

A portal triad consists of which three elements?

Branches of a hepatic artery, hepatic vein, and bile duct

The carbonic acid ion is joined to a hydrogen ion by the enzyme carbonic anhydrase.

False

The enzyme carbonic anhydrase catalyzes the formation of bicarbonate from carbon dioxide and hydrogen.

False

The liver lobule is the same as a hepatocyte.

False

When chyme enters the duodenum, gastric secretion increases.

False

________ ions are actively transported into the gastric gland duct, in exchange for ________ ions which enter the parietal cells.

Hydrogen, Potassium

Which of the following enzymes is produced by the stomach?

Pepsin

Which of the following does NOT stimulate the secretion of HCl in the stomach?

Secretin

Gastrin functions to increase the production of HCl in the stomach.

TRUE

Which of the following might stimulate the cephalic phase of gastric secretion?

The thought of food.

In the parietal cell, carbonic acid dissociates into a bicarbonate ion and a hydrogen ion.

True.

he ion exchange protein in the plasma membrane of parietal cells exchanges ________ ions going out for ________ ions coming in.

bicarbonate, chloride

In the parietal cells, the enzyme carbonic anhydrase causes a reaction between...

carbon dioxide and water.

Secretin is released from the duodenum in response to

hydrochloric acid in chyme.

Hydrochloric Acid is formed...

hydrogen ions and chloride ions join in the duct of the gastric gland.

Gastric secretion during the intestinal phase is inhibited by the

presence of lipids or low pH.