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Bienvenue Astric slow waves is generated in the pacemaker zone slow waves do not elicit contractions. viagra thailand price order generic viagra online viagra thailand price what's bathtubs viagra ads They coordinate contractions by controlling the appearance of action potentials action potentials excitatory neurotransmitters and hormones further depolarize the membrane, thereby increasing the amplitude of the slow wave if the peak of a slow wave rises above a certain threshold, the cell fires one or more action potentials the pyloric sphincter is a ring of smooth muscle and connective tissue between the gastric antrum and the duodenum has two main functions: allows the regulated emptying of gastric contents at a rate consistent with the ability of the duodenum to process chime prevents the regurgitation of duodenal contents back into the stomach control of the pyloric sphincter sympathetic nerve fibres increase the constriction of the pyloric sphincter vagal fibres are either excitatory or inhibitory to pyloric smooth muscle the hormones cholecystokinin (cck), gastrin, gip and secretin all elicit constriction of the sphincter gastric emptying is regulated in response to the nature of the duodenal contents materials that are high in fat digestion products, highly acidic or very hypertonic all decrease the rate of gastric emptying receptors on the mucosa of the duodenum and jejunum sense acidity, osmotic pressure, certain fats, amino acids and peptides and cause the release of enteric hormones (cck, gastrin, gip and secretin) enteric hormones inhibit antral contractions and/or elicit constriction of the pyloric sphincter, thereby decreasing the rate of gastric emptying migrating motor complex (mmc) the migrating motor (or myoelectric) complex (mmc) is a distinct pattern of gi motility observed during periods between meals it is thought to serve a “housekeeping” role and sweep residual undigested material from the stomach to the terminal ileum the antrum is quiescent for 75-90 minutes a brief period (5-15 minutes) of intense electrical and motor activity occurs. viagra viagra viagra quale il migliore viagra thailand price Is viagra used for anything else viagra online Powerful contractions sweep down the entire length of the stomach. generic viagra mg pills buy female viagra usa cheap viagra no prescription buy viagra with debit card The pylorus dilates. viagra 100 apteka How much does viagra cost at boots viagra no prescription fastest shipping us Indigestible material is swept into the small intestine this cycle repeats until ingestion of the next meal the periodic nature of the mmc. viagra for daily use canadian pharmacy Viagra effects on blood pressure generic viagra overnight cheap pills viagra buy viagra canada generic viagra for sale Welcome
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