Role of non-quantum acetylcholine secretion in neural control of the membrane potential in skeletal muscle fibers of rats

1996 ◽  
Vol 27 (1) ◽  
pp. 54-57
Author(s):  
A. Kh. Urazaev ◽  
S. T. Magsumov ◽  
G. I. Poletaev
Keyword(s):  
Skeletal Muscle ◽  
Membrane Potential ◽  
Neural Control ◽  
Muscle Fibers ◽  
Skeletal Muscle Fibers

scholarly journals Role of Nebulin on Actomyosin Interaction Studied in situ in Demembranated Skeletal Muscle Fibers from Newborn Mice

2009 ◽  
Vol 96 (3) ◽  
pp. 127a
Author(s):  
M.L. Bang ◽  
M. Caremani ◽  
E. Brunello ◽  
R. Littlefield ◽  
R. Lieber ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibers ◽  
Newborn Mice ◽  
Skeletal Muscle Fibers ◽  
Actomyosin Interaction

Extracellular divalent cations in excitation–contraction coupling: hypertonic solution effects

1982 ◽  
Vol 60 (4) ◽  
pp. 440-445
Author(s):  
Isao Oota ◽  
Isao Kosaka ◽  
Torao Nagai ◽  
Hideyo Yabu
Keyword(s):  
Skeletal Muscle ◽  
Divalent Cations ◽  
Muscle Fibers ◽  
Hypertonic Solution ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Skeletal Muscle Fibers ◽  
Membrane Bound

It is the purpose of this article to point out that the membrane-bound Ca plays an important role in excitation–contraction (E–C) coupling of skeletal muscle fibers and that other divalent cations are unable to substitute for this role of membrane-bound Ca.

scholarly journals Myofibrillar tightly bound calcium in skeletal muscle fibers: a possible role of this cation in titin strands aggregation

FEBS Letters ◽  
2003 ◽  
Vol 556 (1-3) ◽  
pp. 271-275 ◽  
Author(s):  
Gerald Coulis ◽  
Miguel A Sentandreu ◽  
Nathalie Bleimling ◽  
Mathias Gautel ◽  
Yves Benyamin ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibers ◽  
Skeletal Muscle Fibers

scholarly journals Role of STIM1 And Orai1 in the Formation of Tubular Aggregates in Ageing Skeletal Muscle Fibers

2017 ◽  
Vol 112 (3) ◽  
pp. 98a
Author(s):  
Claudia Pecorai ◽  
Antonio Michelucci ◽  
Laura Pietrangelo ◽  
Feliciano Protasi ◽  
Simona Boncompagni
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibers ◽  
Tubular Aggregates ◽  
Skeletal Muscle Fibers

scholarly journals Calcium Sparks in Intact Skeletal Muscle Fibers of the Frog

2001 ◽  
Vol 118 (6) ◽  
pp. 653-678 ◽  
Author(s):  
S. Hollingworth ◽  
J. Peet ◽  
W.K Chandler ◽  
S.M. Baylor
Keyword(s):  
Skeletal Muscle ◽  
Membrane Potential ◽  
Rise Time ◽  
Rana Temporaria ◽  
Muscle Fibers ◽  
Fluorescence Decay ◽  
Half Maximum ◽  
Calcium Sparks ◽  
Mean Values ◽  
Skeletal Muscle Fibers

Calcium sparks were studied in frog intact skeletal muscle fibers using a home-built confocal scanner whose point-spread function was estimated to be ∼0.21 μm in x and y and ∼0.51 μm in z. Observations were made at 17–20°C on fibers from Rana pipiens and Rana temporaria. Fibers were studied in two external solutions: normal Ringer's ([K+] = 2.5 mM; estimated membrane potential, −80 to −90 mV) and elevated [K+] Ringer's (most frequently, [K+] = 13 mM; estimated membrane potential, −60 to −65 mV). The frequency of sparks was 0.04–0.05 sarcomere−1 s−1 in normal Ringer's; the frequency increased approximately tenfold in 13 mM [K+] Ringer's. Spark properties in each solution were similar for the two species; they were also similar when scanned in the x and the y directions. From fits of standard functional forms to the temporal and spatial profiles of the sparks, the following mean values were estimated for the morphological parameters: rise time, ∼4 ms; peak amplitude, ∼1 ΔF/F (change in fluorescence divided by resting fluorescence); decay time constant, ∼5 ms; full duration at half maximum (FDHM), ∼6 ms; late offset, ∼0.01 ΔF/F; full width at half maximum (FWHM), ∼1.0 μm; mass (calculated as amplitude × 1.206 × FWHM3), 1.3–1.9 μm3. Although the rise time is similar to that measured previously in frog cut fibers (5–6 ms; 17–23°C), cut fiber sparks have a longer duration (FDHM, 9–15 ms), a wider extent (FWHM, 1.3–2.3 μm), and a strikingly larger mass (by 3–10-fold). Possible explanations for the increase in mass in cut fibers are a reduction in the Ca2+ buffering power of myoplasm in cut fibers and an increase in the flux of Ca2+ during release.

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