THE ULTRASTRUCTURE OF STRIATED MUSCLE AT VARIOUS SARCOMERE LENGTHS
نویسندگان
چکیده
منابع مشابه
The Ultrastructure of Striated Muscle at Various Sarcomere Lengths
1. Rest and equilibrium length muscle sarcomeres are composed of thin filaments (actin) which traverse the sarcomeres from the Z membranes up to the H band; at this level the filaments are considerably thicker and less numerous. 2. Shortening of muscle is associated with a transformation of thin into thick filaments in the A band. 3. These observations are discussed in terms of interaction of a...
متن کاملT H E Ultrastructure of Striated Muscle at Various Sarcomere Lengths*. by David Spiro, M.d,
I t is generally believed that muscular contractility involves a reversible interaction of the two proteins, actin and myosin. The manner in which this interaction produces contraction or relaxation is not clear, but the fact that it is extremely difficult to demonstrate a change in the wide angle x-ray diffraction pattern when muscle shortens (2) suggests that contractility is associated with ...
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The musculature of the telson of Limulus polyphemus L . consists of three dorsal muscles : the medial and lateral telson levators and the telson abductor, and one large ventral muscle ; the telson depressor, which has three major divisions : the dorsal, medioventral, and lateroventral heads. The telson muscles are composed of one type of striated muscle fiber, which has irregularly shaped myofi...
متن کاملFilament Lengths in Striated Muscle
Filament lengths in resting and excited frog muscles have been measured in the electron microscope, and investigations made of the changes in length that are found under different conditions, to distinguish between those changes which arise during preparation and the actual differences in the living muscles. It is concluded that all the measured differences in filament length are caused by the ...
متن کاملUltrastructure of the Resting and Contracted Striated Muscle Fiber at Different Degrees of Stretch
Passive stretch, isometric contraction, and shortening were studied in electron micrographs of striated, non-glycerinated frog muscle fibers. The artifacts due to the different steps of preparation were evaluated by comparing sarcomere length and fiber diameter before, during, and after fixation and after sectioning. Tension and length were recorded in the resting and contracted fiber before an...
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ژورنال
عنوان ژورنال: The Journal of Biophysical and Biochemical Cytology
سال: 1956
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.2.4.157