Which of the following statements regarding the regulation of gastrointestinal motility is true?

The gastrointestinal tract is regulated by both the sympathetic and parasympathetic branches of the autonomic nervous system. The parasympathetic system is stimulatory and the sympathetic system is inhibitory. The CNS does influence motility and secretory activity through the autonomic nervous system. Numerous endocrine factors (secretin, gastrin, cholecystokinin, etc.) are also involved with the regulation of gastrointestinal activity.