Final answer:
The parasympathetic division of the autonomic nervous system dominates in the GI tract, controlling restful and digestive functions.
Step-by-step explanation:
In the GI tract, the parasympathetic division of the autonomic nervous system dominates. The parasympathetic division is responsible for restful and digestive functions. It increases GI secretion and motility by stimulating neurons of the enteric nervous system, which controls the smooth muscle and glandular tissue in the digestive system.