( ( When ( ( the stomach ) empties ) ) ( , ( ( ( ( ( the ( ( partially digested ) food ) ) , ) ( now ( called chyme ) ) ) , ) ( ( ( passes ( through ( the ( pyloric sphincter ) ) ) ) ( into ( ( ( the duodenum ) , ) ( ( the ( upper portion ) ) ( of ( the ( small intestine ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN stomach)) (VP (VBZ empties)))) (, ,) (NP (NP (DT the) (ADJP (RB partially) (JJ digested)) (NN food)) (, ,) (VP (ADVP (RB now)) (VBN called) (S (ADJP (JJ chyme)))) (, ,)) (VP (VBZ passes) (PP (IN through) (NP (DT the) (JJ pyloric) (NN sphincter))) (PP (IN into) (NP (NP (DT the) (NN duodenum)) (, ,) (NP (NP (DT the) (JJ upper) (NN portion)) (PP (IN of) (NP (DT the) (JJ small) (NN intestine))))))) (. .)))
When the stomach empties, the partially digested food, now called chyme, passes through the pyloric sphincter into the duodenum, the upper portion of the small intestine.
(ROOT (S (NP (JJ Gastric) (NN emptying)) (VP (VBZ is) (VP (VBN regulated) (PP (IN by) (NP (NP (PDT both) (DT the) (NN stomach)) (CC and) (NP (DT the) (NN duodenum)))))) (. .)))