39. Digestive System
Digestion
3:10 minutes
Problem 5c
Textbook Question
Textbook QuestionIf you put the following events in the order they occur in the human digestive system, the third event in the series would be a. Cells in gastric pits secrete protons. b. Pepsin activates pepsinogen. c. HCl activates pepsinogen. d. Partially digested food enters the small intestine.
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