Final answer:
Afferent signals involved in the peristalsis of the stomach are provided by the enteric nervous system, while efferent signals are the motor neuron impulses that lead to muscle contractions moving food through the digestive system.
Step-by-step explanation:
The 1) afferent signals for peristalsis in the stomach originate from the enteric nervous system, specifically receptors in the stomach wall that detect stretching as food enters. The intrinsic innervation of the alimentary canal is provided by the enteric nervous system, which includes two major nerve plexuses: the myenteric plexus and the submucosal plexus. The myenteric plexus coordinates the muscle contractions that are part of peristalsis, whereas the submucosal plexus regulates digestive secretions and local blood flow.
The 2) efferent signals for peristalsis involve the motor neurons in these plexuses, which stimulate the smooth muscle contractions that propel food through the digestive tract towards the small intestine. The muscle layers in the alimentary canal, under the control of the enteric nervous system, facilitate the rhythmic contractions known as peristalsis.