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.
