scholarly journals Extra activation component of calcium release in frog muscle fibres

2002 ◽  
Vol 542 (3) ◽  
pp. 867-886 ◽  
Author(s):  
Paul C. Pape ◽  
Karine Fénelon ◽  
Nicole Carrier
Keyword(s):  
Calcium Release ◽  
Frog Muscle ◽  
Muscle Fibres ◽  
Activation Component

scholarly journals Potentiometric measurement of membrane action potentials in frog muscle fibres

1966 ◽  
Vol 183 (1) ◽  
pp. 152-166 ◽  
Author(s):  
B. Frankenhaeuser ◽  
B. D. Lindley ◽  
R. S. Smith
Keyword(s):  
Action Potentials ◽  
Frog Muscle ◽  
Muscle Fibres ◽  
Membrane Action ◽  
Potentiometric Measurement

Studies on the 14.5 nm Meridional X-Ray Diffraction Reflection During Length Changes of Intact Frog Muscle Fibres

1998 ◽  
pp. 247-258 ◽  
Author(s):  
P. J. Griffiths ◽  
H. Amenitsch ◽  
C. C. Ashley ◽  
M. A. Bagni ◽  
S. Bernstorff ◽  
...  
Keyword(s):  
Frog Muscle ◽  
Muscle Fibres ◽  
Diffraction Reflection ◽  
X Ray Diffraction ◽  
X Ray ◽  
Length Changes

The spindle and extrafusal innervation of a frog muscle

1957 ◽  
Vol 146 (924) ◽  
pp. 416-430 ◽  
Keyword(s):  
Muscle Fibre ◽  
Short Distance ◽  
Frog Muscle ◽  
Muscle Fibres ◽  
Intrafusal Muscle ◽  
Intrafusal Fibre ◽  
Unmyelinated Axons ◽  
Intrafusal Fibres ◽  
Break Up ◽  
Tonic System

In the frog muscle, ext. long. dig. IV, there are two or three spindle systems. Each consists of a bundle of intrafusal muscle fibres with two, three or four discrete encapsulated sensory regions distributed in mechanical series along it. A sensory region is usually comprised of the coiled branches of one afferent axon. These embrace the intrafusal fibres and ultimately form long fine varicose endings on or near them. The intrafusal striations appear to be lost for a short distance within the sensory region, and in this region the intrafusal fibre nuclei crowd together. The ‘small’ extrafusal efferents break up into trusses of fine unmyelinated axons and terminate as ‘grape’ end-plates, several of which can occur on the same muscle fibre. This is the ‘tonic’ system. The ‘large’ extrafusal efferents terminate as ‘Endbiischel’ end-plates on muscle fibres not supplied by grape endings. This is the ‘twitch’ system. Both ‘grape' and ‘twitch’ end-plates occur on the intrafusal bundle (probably on separate fibres) between the sensory regions. They are supplied by branches of ‘small’ or ‘large’ axons respectively, which also innervate extrafusal fibres. Thus like the extrafusals the intrafusal bundle is composed of ‘tonic’ and ‘twitch’ muscle fibres. This situation contrasts with that of the mammal, where extrafusals are exclusively ‘twitch’ fibres and intrafusals ‘tonic’.

Ca(2+)- and pH-dependent halothane stimulation of Ca2+ release in sarcoplasmic reticulum from frog muscle

1996 ◽  
Vol 271 (2) ◽  
pp. C540-C546 ◽  
Author(s):  
M. Beltran ◽  
R. Bull ◽  
P. Donoso ◽  
C. Hidalgo
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Calcium Release ◽  
Release Kinetics ◽  
Frog Muscle ◽  
Time Range ◽  
Frog Skeletal Muscle ◽  
Open Probability ◽  
Filtration System ◽  
Stimulation Of

The effect of halothane on calcium release kinetics was studied in triad-enriched sarcoplasmic reticulum vesicles from frog skeletal muscle. Release from vesicles passively equilibrated with 3 mM 45CaCl2 was measured in the millisecond time range by use of a fast-filtration system. Halothane (400 microM) increased release rate constants at pH 7.1 and 7.4 as a function of extravesicular pCa. In contrast, halothane at pH 6.8 produced the same stimulation of release from pCa 7.0 to 3.0; no release took place in these conditions in the absence of halothane. Halothane shifted the calcium activation curve at pH 7.1, but not at pH 7.4, to the left and increased channel open probability at pH 7.1 in the cis pCa range of 7.0 to 5.0. These results indicate that cytosolic pCa and pH modulate the stimulatory effects of halothane on calcium release. Furthermore, halothane stimulated release in frog skeletal muscle at low pH and resting calcium concentration, indicating that in frog muscle halothane can override the closing of the release channels produced by these conditions, as it does in malignant hyperthermia-susceptible porcine muscle.

scholarly journals Changes in crossbridge and non-crossbridge energetics during moderate fatigue of frog muscle fibres.

1993 ◽  
Vol 468 (1) ◽  
pp. 543-556 ◽  
Author(s):  
C J Barclay ◽  
N A Curtin ◽  
R C Woledge
Keyword(s):  
Frog Muscle ◽  
Muscle Fibres ◽  
Moderate Fatigue

scholarly journals Effects of solution tonicity on crossbridge properties and myosin lever arm disposition in intact frog muscle fibres

2006 ◽  
Vol 578 (1) ◽  
pp. 337-346 ◽  
Author(s):  
Barbara Colombini ◽  
Maria Angela Bagni ◽  
Giovanni Cecchi ◽  
Peter John Griffiths
Keyword(s):  
Frog Muscle ◽  
Muscle Fibres ◽  
Lever Arm
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