THE EFFECT OF TEMPERATURE VARIATIONS AND OF CERTAIN DRUGS UPON THE GASTRIC MOTILITY OF ELASMOBRANCH FISHES

Abstract

A rise of temperature causes an increase in the rate of the spontaneous contractions of all parts of the stomach. At any one temperature the rate of contraction is different in different parts of the stomach. The parts named in order of decreasing rate are: pylorus, fundic and antral regions of the lesser curvature, fundic region of the greater curvature, antral region of the greater curvature and the cardia.Adrenaline stimulates all parts of the stomach except the antral region where large doses inhibit and minute doses stimulate. Pilocarpine and acetylcholine stimulate all parts. Atropine has no effect on the normal contractions but antagonizes the effect of pilocarpine and acetylcholine.