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Gastrointestinal Physiology Essay Preview: Gastrointestinal Physiology Report this essay Gastrointestinal Physiology Enteric nervous system lies in the wall of the gut (esophagus anus) controls GI movement and secretions consists of 2 plexuses myenteric – peristalsis submucosal – secretion and (local) blood flow axon endings secrete acetylcholine which excites gastrointestinal activity, and norepinephrine, which inhibits.