Types of Motor Units in the Skeletal Muscle of Xenopus laevis
Types of Motor Units in the Skeletal Muscle of Xenopus laevis
复制标题
非洲爪蟾骨骼肌运动单位的类型
DOI：
10.1038/217281a0
复制
发表时间：
1968
期刊：
影响因子：
64.8
通讯作者：
J. Lännergren
中科院分区：
文献类型：
--
作者：
R. Smith;J. Lännergren
对非洲爪蟾和绿色蟾蜍后肢肌肉中肌纤维的组织化学和收缩特性的研究表明，肌纤维的快速组可以细分1。一些快速纤维，通常是直径最大的纤维，氧化酶含量低，脂肪滴很少。在直接电刺激下，这些纤维的收缩机制迅速疲劳。第二组快速纤维由较小直径的细胞组成，显示出高活性的氧化酶，并含有许多脂肪滴。如果反复刺激，这些纤维会长时间保持收缩状态。电子显微镜观察（R. S. Smith和S. Page）证实了组织化学的发现，因为这两种类型的纤维含有不同数量的线粒体和脂肪滴，并且还表明后一组快速纤维中的糖原浓度较高。
INVESTIGATION of the histochemical and contractile characteristics of muscle fibres in hind limb muscles of Xenopus laevis and Bufo viridis has shown that the fast group of muscle fibres can be subdivided1. Some fast fibres, usually those of largest diameter, are low in oxidative enzymes and have few fat droplets. On direct electrical stimulation the contractile mechanism in these fibres rapidly fatigues. The second group of fast fibres consists of cells of smaller diameter showing a high activity of oxidative enzymes and containing many fat droplets. These fibres maintain a contracted state for prolonged periods if repeatedly stimulated. Electron microscope observations (unpublished results of R. S. Smith and S. Page) confirm the histochemical findings in that the two types of fibres contain differing numbers of mitochondria and fat droplets, and also demonstrate a higher concentration of glycogen in the latter group of fast fibres.