BIOC33H3 Lecture Notes - Ghrelin, Parietal Cell, Leptin
4 Oct 2014
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Lec 24 - nervous & hormonal control of digestive system. Sensory afferent connected to interneuron that affects the mortor neuron/enteric neuron causing the smooth muscle to contract. Number of receptor cells in digestive system o o. Trigger reflexes that originate from gut itself or spinal cord/brain to aid secretion of substances for digestion. Mechanoreceptors (examples of mechanoreceptor) o o o o. Distention of the stomach or intestine causes the na+ channels to be pulling down". Increases the number of open sa channels leading to cell depolarization and greater rate of ap firing. Factors in the duodenum that slows the rate of gastric emptying. Osmotic receptor - example of osmotic receptor o. Increases the number of open si channels leading to cell depolarization and greater rate of ap firing. Sensory, inter and motor neurons (enteric neurons) are all in the wall of the gut. Sympathetic ==> decreases in gi activity o o. Parasympathetic ==> increases in gi activity o o.
