HESC2501 Study Guide - Midterm Guide: Nerve Plexus, Small Intestine, Mechanoreceptor
14 Dec 2019
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2 short reflex - controlled by "nerve plexus" within the gi tract (enteric plexus) long reflex - those involving the cns and extrinsic autonomic nerves. Digestive processes occurring in the mouth, pharynx, esophagus. Composition of saliva & control of salivation major components of saliva: water (97-99. 5%) electrolytes: na+, k+, cl-, po4 mucin - protein that forms thick, slimy mucus. Iga antibodies - immune defense lysozyme - antibacterial enzyme salivary amylase - starts breakdown of carbo"s control of salivation: ingestion of foodstuffs activate chemoreceptors and pressoreceptors salivatory nuclei (pons & medulla) . Facial (vii) and glassopharyngeal (ix) nerves secretion by salivary glands. 3 epiglottis blocks off trachea peristaltic waves moves food to stomach. Content of bile and bile release into small intestine. Composition of pancreatic juice and regulation of secretion. 1. 2 - 1. 5 liters per day water and electrolytes (mainly bicarbonate ions) enzymes - precursors and active digestive forms trypsinogen trypsin enterokinase procarboxypeptidase --------> carboxypeptidase chymotrypsinogen trypsin.
