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Hydrochloric Acid Production... of the Stomach (Quiz 2)

How can digestive tissue produce a concentrated acid without damage to cells and molecules exposed to the acid? Tissues associated with the stomach produce not only digestive enzymes but also hydrochloric acid. One type of cell, the parietal cell, secretes HCl which can have a pH as low as 1.5. The HCl helps to chemically break down the food in the stomach. The digestive enzymes have evolved a molecular structure that functions well in a very acid environment. The cells lining the stomach and associated ducts are coated with a protective mucus. The cells are also replaced at a rapid rate.

View the animation below, then complete the quiz to test your knowledge of the concept.

1The 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.

2The ion exchange molecule 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

3________ 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

4The first step in the formation of hydrochloric acid is the active transport of carbon dioxide into the parietal cells.

5The enzyme carbonic anhydrase catalyzes the formation of bicarbonate from carbon dioxide and hydrogen.

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