A43-year-old man eats a meal consisting of 40 percentprotein, 10 percent fat, and 50 percent carbohydrate. hirty minutes later the man feels the urge to defecate. which reflex results in the urge to defecate when theduodenum is stretched? duodenocolicthe appearance of mass movements after mealsis facilitated by gastrocolic and duodenocolic reflexes. these reflexes result from distention of the stomach and duodenum. they are greatly suppressed when the extrinsic autonomic nerves to the colon have been removed; therefore, the reflexes are likely transmitted by way of the autonomic nervous system. all the gut reflexes are named with the anatomical origin of the reflex as the prefix followed by the name of the gut segment in which the outcome of the reflex is observed. for example, the duodeno-colic reflex begins in the duodenum and endsin the colon. when the duodenum is distended, nervous signals are transmitted to the colon, which stimulates mass movements.