Early tension relaxation during a muscle twitch
نویسندگان
چکیده
منابع مشابه
Twitch and tetanic tension during culture of mature Xenopus laevis single muscle fibres.
Investigation of the mechanisms of muscle adaptation requires independent control of the regulating factors. The aim of the present study was to develop a serum-free medium to culture mature single muscle fibres of Xenopus laevis. As an example, we used the culture system to study adaptation of twitch and tetanic force characteristics, number of sarcomeres in series and fibre cross-section. Fib...
متن کاملThe plateau of full activity during a muscle twitch.
The active state of a muscle, after excitation by a single shock, rises rapidly to its full extent and then remains on a level or ‘p la teau ’ until relaxation begins to set in. The end of the ‘p la teau ’ is considerably earlier than the m aximum of a normal tw itch, bu t the method of quick stretches is no t adequate to define it more accurately. In the m ethod described in this paper a muscl...
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Several phospholipase A(2) (PLA(2)) neurotoxins from snake venoms can affect acetylcholine release at the neuromuscular junction. In isolated nerve-muscle preparations three distinct phases have been described for this phenomenon: An initial transient decrease in twitch tension; a second facilitatory phase during which twitch height is greater than control twitch height; and the last phase whic...
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In skeletal muscle fibers, action potentials elicit contractions by releasing calcium ions (Ca(2+)) from the sarcoplasmic reticulum. Experiments on individual mouse muscle fibers micro-injected with a rapidly responding fluorescent Ca(2+) indicator dye reveal that the amount of Ca(2+) released is three- to fourfold larger in fast-twitch fibers than in slow-twitch fibers, and the proportion of t...
متن کاملOn the relation between force and shortening during muscle twitch.
During the contraction phase of isotonic twitch there must be the change of muscle force. When initial acceleration was augmented by using heavy load or inertia lever 1,2,3), the muscle tension developed far bigger than the load and the condition of twitch was not 'isotonic' in real meaning. As far as a single twitch was concerned, the change of force should not be neglected. In the previous st...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1951
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1951.sp004576