AP Biology : Understanding Stomach Enzymes and Cell Types

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #11 : Digestive Physiology

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

goblet . . . bile

chief . . . bile

parietal . . . mucous

pariental . . . lipase

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 #12 : Digestive Physiology

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

Possible Answers:

proton pump

ATP synthase

sodium-potassium pump

None of these

hydrochloric acid channel

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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