MECHANICAL RESPONSES TO CATECHOLAMINES IN ISOLATED STRIPS OF THE GUINEA-PIG STOMACH MUSCLE
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概要
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Effects of catecholamines were investigated on isolated strips of the guineapig stomach. In the circular muscles, the relaxation and biphasic response caused by adrenaline and noradrenaline were suppressed partly by phentolamine and also partly by propranolol. The relaxation by catecholamines in the longitudinal muscles was inhibited mainly by propranolol. Thus, there are probably two types of relaxation. Alpha relaxation was more dominant in the circular muscles and β relaxation in the longitudinal muscles. Contractions in both muscles were mediated through alpha-effects. The circular muscle is more sensitive to the alpha effect and the longitudinal muscle to the beta effect. In the presence of propranolol, isoprenaline caused a mono-phasic contraction. This is evidence of an alpha effect of isoprenaline. Field stimulation which excited intramural nerves resulted in contraction followed by relaxation in both circular and longitudinal muscles. The inhibition of the electrically evoked contractions by adrenaline and noradrenaline in both circular and longitudinal muscles was abolished by phentolamine but the electrically evoked relaxations were affected little.
- 社団法人 日本薬理学会の論文
著者
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YAMAGUCHI Tsuyoshi
Department of Experimental Pathology and Tumor Biology, Graduate School of Medical Sciences, Nagoya
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TOMITA Tadao
Department of Thoracic Surgery and Department of Physiology
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Tomita Tadao
Department Of Physiology School Of Medicine Nagoya University
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Yamaguchi Tsuyoshi
Department Of Applied Physics Faculty Of Engineering Shizuoka University
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YAMAGUCHI Tsuyoshi
Department of Physiology. Faculty of Medicine, Kyushu University and Fukuoka University
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