The second regulatory agent of the digestive system is the nervous system

The second regulatory agent of the digestive system is the nervous system

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The second regulatory agent of the digestive system is the nervous system. Stimuli that influence  digestive activities may originate in the head, the stomach, or the small intestine. Based on these  sites, there are three phases of digestive regulation:  1. The  cephalic phase  comprises those stimuli that originate from the head: sight, smell,  taste, or thoughts of food, as well as emotional states. In response, the following reflexes  are initiated:  1. Neural response:  Stimuli that arouse digestion are relayed to the  hypothalamus, which in turn initiates nerve impulses in the parasympathetic vagus  nerve. These impulses innervate nerve networks of the GI tract (enteric nervous  system), which promote contraction of smooth muscle (which causes peristalsis) and  secretion of gastric juice. Stimuli that repress digestion (emotions of fear or anxiety,  for example) innervate sympathetic fibers that suppress muscle contraction and 
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This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.

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The second regulatory agent of the digestive system is the nervous system

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