HBS204 Lecture Notes - Lecture 11: Gastric Inhibitory Polypeptide, Enterochromaffin-Like Cell, Parasympathetic Nervous System
Document Summary
Gi system, things like gastric secretions, motility, saliva secretion are all strongly stimulated by the neurotransmitter acetylcholine. Some neural reflexes are entirely contained in the walls of the gi tract and others leave and are involved in the cns short and long neural reflexes. All reflexes involve a stimulus that travels to the integrating centre and then a response travels back. In the gi system there are two possible integrating centres the enteric nervous system (in the wall of the gi tract) and the. Central nervous system (spinal cord and the brain), so there can be reflex arcs that involve either one of those systems, the different is the distance that the reflex arc travels. There are around 30 hormones that influence gi function, we will only focus on some, it is a very complicated area. Secretion and motility are controlled primarily by gastrin, cholecystokinin (cck) and secretin, other hormone have affects on gi system.
