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The gastrocnemius muscle is heterogeneous, composed of both "red" and "pale" muscle, and thus containing fast-twitch high force fibers. Henneman's and colleagues took advantage of the differences between the soleus and gastrocnemius muscles to show that the neurons innervating the soleus muscle:
The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. [1] According to the sliding filament theory, the myosin ( thick filaments ) of muscle fibers slide past the actin ( thin filaments ) during muscle contraction, while the two groups of filaments ...
In vitro muscle testing can be done on any scale of muscle organization - entire groups of muscles (provided they share a common insertion or origin, as in the human quadriceps), a single muscle, a "bundle" of muscle fibers, a single muscle fiber, a single myofibril, a single sarcomere, a cardiomyocyte or even a half-sarcomere. Muscle fibers ...
The number of muscle fibers within each unit can vary within a particular muscle and even more from muscle to muscle: the muscles that act on the largest body masses have motor units that contain more muscle fibers, whereas smaller muscles contain fewer muscle fibers in each motor unit. [1]
Similarly, the higher the contraction velocity, the lower the tension in the muscle. This hyperbolic form has been found to fit the empirical constant only during isotonic contractions near resting length. [1] The muscle tension decreases as the shortening velocity increases. This feature has been attributed to two main causes.
Muscle & Nerve is a monthly peer-reviewed medical journal covering neuromuscular medicine. It was founded in 1978 by Walter Bradley. [ 1 ] It is published by John Wiley & Sons on behalf of the American Association of Neuromuscular & Electrodiagnostic Medicine , of which it has been the official journal since 1982. [ 2 ]
The Journal of Physiology is a semi-monthly peer-reviewed scientific journal that was established in 1878 and is published by Wiley-Blackwell on behalf of The Physiological Society. It covers research on all aspects of physiology , with an emphasis on human and mammalian physiology , including work at the molecular level, at the level of the ...