scholarly journals Enhancement of mechanical performance in frog muscle fibres after quick increases in load.

1981 ◽  
Vol 319 (1) ◽  
pp. 239-252 ◽  
Author(s):  
H Sugi ◽  
T Tsuchiya
Keyword(s):  
Mechanical Performance ◽  
Frog Muscle ◽  
Muscle Fibres

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

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’.

Effects of BAPTA on force and Ca2+ transient during isometric contraction of frog muscle fibers

1998 ◽  
Vol 275 (2) ◽  
pp. C375-C381 ◽  
Author(s):  
Y.-B. Sun ◽  
C. Caputo ◽  
K. A. P. Edman
Keyword(s):  
Mechanical Performance ◽  
Muscle Fibers ◽  
Frog Muscle ◽  
Clear Correlation ◽  
Bathing Solution ◽  
Control Value ◽  
Contractile System ◽  
Intracellular Ca ◽  
Cross Bridges ◽  
Reduced State

The effects of 1,2-bis(2-aminophenoxy)ethane- N, N, N′, N′-tetraacetic acid (BAPTA) on force and intracellular Ca2+ transient were studied during isometric twitches and tetanuses in single frog muscle fibers. BAPTA was added to the bathing solution in its permeant AM form (50 and 100 μM). There was no clear correlation between the changes in force and the changes in Ca2+ transient. Thus during twitch stimulation BAPTA did not suppress the Ca2+ transient until the force had been reduced to <50% of its control value. At the same time, the peak myoplasmic free Ca2+concentration reached during tetanic stimulation was markedly increased, whereas the force was slightly reduced by BAPTA. The effects of BAPTA were not duplicated by using another Ca2+ chelator, EGTA, indicating that BAPTA may act differently as a Ca2+ chelator. Stiffness measurements suggest that the decrease in mechanical performance in the presence of BAPTA is attributable to a reduced number of active cross bridges. The results could mean that BAPTA, under the conditions used, inhibits the binding of Ca2+ to troponin C resulting in a reduced state of activation of the contractile system.

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

scholarly journals Crossbridge properties during force enhancement by slow stretching in single intact frog muscle fibres

2007 ◽  
Vol 585 (2) ◽  
pp. 607-615 ◽  
Author(s):  
Barbara Colombini ◽  
Marta Nocella ◽  
Giulia Benelli ◽  
Giovanni Cecchi ◽  
Maria Angela Bagni
Keyword(s):  
Frog Muscle ◽  
Muscle Fibres ◽  
Force Enhancement

scholarly journals The permeability of frog muscle fibres to lithium ions

1959 ◽  
Vol 147 (3) ◽  
pp. 626-638 ◽  
Author(s):  
R. D. Keynes ◽  
R. C. Swan
Keyword(s):  
Frog Muscle ◽  
Muscle Fibres ◽  
Lithium Ions
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