In response to the arrival of acid chyme in the duodenum, the
A) blood levels of secretin rise.
B) blood levels of cholecystokinin fall.
C) blood levels of gastrin rise.
D) blood levels of vasoactive intestinal peptide (VIP) fall.
E) blood levels of gastrin rise and blood levels of vasoactive intestinal peptide (VIP) fall.
Answer: A
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