AP Biology : Understanding Stomach Enzymes and Cell Types

Study concepts, example questions & explanations for AP Biology

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Example Questions

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Example Question #31 : Digestive System

The __________ cell of the stomach are responsible for secreting the __________ that lines the stomach and protects its epithelial cells from its highly acid contents.

Possible Answers:

goblet . . . mucous

parietal . . . mucous

chief . . . bile

pariental . . . lipase

goblet . . . bile

Correct answer:

goblet . . . mucous

Explanation:

The surface mucous cells secrete mucous, which covers the cells that line the stomach. Without proper mucous secretion, the stomach can become damaged or even perforated. 

Example Question #32 : Digestive System

The parietal cells of the stomach secrete acid through the use of a __________.

Possible Answers:

None of these

ATP synthase

hydrochloric acid channel

sodium-potassium pump

proton pump

Correct answer:

proton pump

Explanation:

The parietal cells use a proton pump to release hydrogen ions into the stomach in the form of hydrochloric acid. This pump is the target of PPI (proton pump inhibitor) medications that work to reduce stomach acid.

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