試題詳解

20. The function of the sphincter between the stomach and small intestine is to
(A) retain chyme in the stomach until pepsin digestion is complete.
(B) periodically release chyme into the small intestine in squirts.
(C) release bile into the duodenum when chyme is present.
(D) release pancreatic secretions into the duodenum when chyme is present.
(E) pancreatic secretions transiently into the duodenum when chyme is present.