タツナミガイ心臓の単一筋束標本の搏動に及ぼす伸張の影響

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The present paper deals with the effect of stretching on the beat of single muscle preparations isolated from the vantricular wall of the marine mollusc, Dolabella auricula. The heart wall of this animal consists of a three-dimentional network of muscle bundles of various size, branching and anastomozing. The thickness of each muscle bundle differs according to regions. The muscle bundle and its network become finer as they approach the outer surface of the heart wall.In the ventricle, the muscle bundle is thicker and the network is more compact than in the auricle. The heart wall which has been spread out repeats the beat periodically under suitable conditions, in which some muscle bundles contract strongly and others weakly according to the organization of the network and their relative positions shift. When a part of the wall is stretched toward one direction, each bundle in the stretched part is rearranged by the tension applied and the contraction proceeds strongly to the direction of stretching. A single musclebundle having an adequate length for the experiment can be isolated easily fromthe inner wall of the ventricle. The isolated preparation, in good condition, has one pace maker and repeats the normal beat periodically. By a stretching of small degree, the isolated bundle usually becomes to repeat the normal beat. periodically. Namely, some preparations stopping to beat initiate the beat and some preparations having a local contraction become to show the transmission of contraction. By a strong stretching, a secondary pace meker region takes place, in which a new contraction initiates by the stretching due to the original contraction. The frequency of beat, which is dependent on the previous history with respectto stretching, increases generally when the preparation is stretched. The amplitude of contraction estimated at each part of the preperation increases gradually to an certain level as the stretch is increased. In some preparations, the velocity of transmission of the contraction wave was found to increase by stretching.
社団法人日本動物学会の論文
1961-11-15

タツナミガイ心臓の単一筋束標本の搏動に及ぼす伸張の影響

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