Which of the following activities are controlled by the neurons?

a. secretion of saliva

b. gastric secretion

c. intestinal secretion

d. peristalsis

The activities of the gastro-intestinal tract are under neural control. The sight, smell and/or the presence of food in the oral cavity can stimulate the secretion of saliva. Gastric and intestinal secretions are also, similarly, stimulated by neural signals. The muscular activities of different parts (like peristalsis) of the alimentary canal can also be moderated by neural mechanisms.