Question

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30. Secondary active transport of Na+ and H+ into absorptive cells both occur, co-transporting products of protein digestion with them.

A. True

B. False

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31. Pancreatic lipase is first secreted by the pancreas in an inactive form, which then gets activated once it enters the lumen of the small intestine.

A. True

B. False

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36. During the Cephalic and Gastric Phases of the control of stomach activity, by what mechanism does histamine cause increased H+ secretion by parietal cells?

A. histamine stimulates the cell to generate more carbonic anhydrase

B. histamine decreases the inhibitory effect of somatostatin

C. histamine causes more H+ /K+ pumps to be inserted into the luminal membrane

D. histamine causes increased secretion of gastrin

Answer 1

30) True

Explanation: Secondary active transport is a type of active transport across a biological membrane in which a transporter protein couples the movement of an ion (typically Na+ or H+) down its electrochemical gradient to the uphill movement of another molecule or ion against a concentration/electrochemical gradient.

31) False

explanation: Pancreatic lipase is secreted in an active form, but its activity is enhanced by bile salts.

32)  C. histamine causes more H+ /K+ pumps to be inserted into the luminal membrane

Explanation: Histamine directly acts on the parietal cells to increase H+/K+ pump to increase acid secretion.