Fiber Ultrastructure and Contraction Kinetics in Insect Fast Muscles
Fiber Ultrastructure and Contraction Kinetics in Insect Fast Muscles
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昆虫快速肌的纤维超微结构和收缩动力学
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
D. Young
中科院分区：
文献类型：
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作者：
R. Josephson;D. Young
概要。测量了不同蝉种鼓膜肌肉的等长收缩动力学并量化了纤维结构。抽搐持续时间与肌原纤维的大小以及肌原纤维与肌浆网 (SR) 和 T 管的纤维体积分数的比率直接相关（快速肌肉具有较小的肌原纤维和相对较大的 SR 和 T 管体积）。抽搐持续时间与纤维大小、肌节长度或线粒体纤维的分数体积没有显着相关，表明这些结构特征与等长收缩动力学的确定没有密切相关。在tettigoniid NeoconocephalusRobustus中，雄性动物前翅肌肉的抽搐在成虫蜕皮后的前五天内逐渐变短。收缩动力学的这种变化与 SR 和 T 管相对体积的增加有关。去神经支配阻碍了快速动力学的获得，表明神经输入对于这种转变是必要的。
SYNOPSIS. Isometric contraction kinetics were measured and fiber structure was quantified in tymbal muscles from different cicada species. Twitch duration is directly correlated with the size of the myofibrils and with the ratio of the fraction of fiber volume which is myofibril to that which is sarcoplasmic reticulum (SR) and T-tubules (fast muscles have small myofibrils and a relatively large volume of SR and T-tubules). Twitch duration is not significantly correlated with fiber size, with sarcomere length, nor with the fractional volume of the fibers which is mitochondria, indicating that these structural features are not strongly involved in the determination of isometric contraction kinetics. In the tettigoniid Neoconocephalus robustus , twitches from forewing muscles of male animals become progressively shorter over the first five days following the adult molt. This change in contraction kinetics is associated with an increase in the relative volume of SR and T-tubules. Denervation blocks the acquisition of rapid kinetics, indicating that neural input is necessary for this transformation.