Physiology

Which one of the following statements regarding the regulation of gastrointestinal function is true?

The main sympathetic nerve supply to the digestive tract is the vagus.

In general, sympathetic stimulation is excitatory to digestive activity.

Salivary secretion is stimulated by both branches of the autonomic nervous system, although not to the same degree.

Parasympathetic stimulation of the salivary glands produces a saliva rich in mucus.