. Dental materia medica, therapeutics and prescription writing. 4. Motility of smallintestine PLATE XVIII. CATHARTICS. The natural provision for intestinal evacuation in-cludes three factore: First. A certain amount of indigestible matter inthe food. Second. Peristaltic motion from the stomach down-ward. Third. A certain degree of fluidity of contents. A decrease of any one factor tends to constipation, while an increase tends to diarrhoea. Cathartics act by influencing these several factors. Laxative foods act by reason of their indigestibleresidue. Almost any cathartic may have
. Dental materia medica, therapeutics and prescription writing. 4. Motility of smallintestine PLATE XVIII. CATHARTICS. The natural provision for intestinal evacuation in-cludes three factore: First. A certain amount of indigestible matter inthe food. Second. Peristaltic motion from the stomach down-ward. Third. A certain degree of fluidity of contents. A decrease of any one factor tends to constipation, while an increase tends to diarrhoea. Cathartics act by influencing these several factors. Laxative foods act by reason of their indigestibleresidue. Almost any cathartic may have simply alaxative effect when used in small doses. Purges, by their irritating action, stimulate peris-talsis, the milder ones acting mainly upon the largeintestine (1). Some, in large doses, approach drasticsin severity of action (5). The absence of bile dimin-ishes the activity of podophyllum, jalapa, rheiun,senna, and scammonium. Hydragogues act in two ways: The less irritating salines cause a marked increaseof fluid by determining a flow of serum from the bloodinto the intestine (3). A low blood-pr
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