( ( Gastric secretion ) ( ( is ( controlled ( by ( ( ( nerve impulses ) and ) ( the ( hormone gastrin ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Gastric) (NN secretion)) (VP (VBZ is) (VP (VBN controlled) (PP (IN by) (NP (NP (NN nerve) (NNS impulses)) (CC and) (NP (DT the) (NN hormone) (NN gastrin)))))) (. .)))
Gastric secretion is controlled by nerve impulses and the hormone gastrin .
(ROOT (S (NP (NNP Gastrin)) (VP (VBZ signals) (NP (NP (DT the) (NN secretion)) (PP (IN of) (NP (JJ gastric) (NN acid))))) (. .)))