Effect of divalent cations on the potassium contracture of slow muscle fibers ofRana temporaria

1987 ◽  
Vol 100 (1) ◽  
pp. 215-220 ◽  
Author(s):  
H. Schmidt
Keyword(s):  
Divalent Cations ◽  
Muscle Fibers ◽  
Slow Muscle ◽  
Potassium Contracture ◽  
Ofrana Temporaria

Effect of External Calcium and other Divalent Cations on K+ Contractures in Denervated Slow Skeletal Muscle Fibers of the Frog

2019 ◽  
Author(s):  
Leonardo Hernández
Keyword(s):  
Skeletal Muscle ◽  
Binding Capacity ◽  
Divalent Cations ◽  
Muscle Fibers ◽  
Free Calcium ◽  
Slow Skeletal Muscle ◽  
Skeletal Muscle Fibers ◽  
Free Calcium Concentration ◽  
Chronic Denervation ◽  
Denervated Muscles

The influence of Ca2+ and other divalent cations on contractile responses of slow skeletal muscle fibers of the frog (Rana pipiens) under conditions of chronic denervation was investigated.Isometric tension was recorded from slow bundles of normal and denervated cruralis muscle in normal solution and in solutions with free calcium concentration solution or in solutions where other divalent cations (Sr2+, Ni2+, Co2+ or Mn2+) substituted for calcium. In the second week after nerve section, in Ca2+-free solutions, we observed that contractures (evoked from 40 to 80 mM-K+) of non-denervated muscles showed significantly higher tensions (p<0.05), than those from denervated bundles. Likewise, in solutions where calcium was substituted by all divalent cations tested, with exception of Mn2+, the denervated bundles displayed lower tension than non-denervated, also in the second week of denervation. In this case, the Ca2+ substitution by Sr2+ caused the higher decrease in tension, followed by Co2+ and Ni2+, which were different to non-denervated bundles, as the lowest tension was developed by Mn2+, followed by Co2+, and then Ni2+ and Sr2+. After the third week, we observed a recovery in tension. These results suggest that denervation altering the binding capacity to divalent cations of the voltage sensor.

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.

Vertebrate slow muscle fibers.

1970 ◽  
Vol 50 (1) ◽  
pp. 40-62 ◽  
Author(s):  
A Hess
Keyword(s):  
Muscle Fibers ◽  
Slow Muscle

scholarly journals In Vivo Studies on Fast and Slow Muscle Fibers in Cat Extraocular Muscles

1966 ◽  
Vol 49 (6) ◽  
pp. 1177-1198 ◽  
Author(s):  
PAUL BACH-y-RITA ◽  
FUMIO ITO
Keyword(s):  
Extraocular Muscle ◽  
Muscle Fibers ◽  
Nerve Fibers ◽  
Slow Muscle ◽  
In Vivo Studies ◽  
Muscle Fiber Types ◽  
Fiber Types ◽  
Conduction Velocities ◽  
Frequency Of Stimulation

In anesthetized in vivo preparations, responses of two types of extraocular muscle fibers have been studied. The small, multiply innervated slow fibers have been shown to be capable of producing propagated impulses, and thus have been labeled slow multi-innervated twitch fibers. Fast and slow multi-innervated twitch fibers are distinguished by impulse conduction velocities, by ranges of membrane potentials, by amplitudes and frequencies of the miniature end plate potentials, by responses to the intravenous administration of succinylcholine, by the frequency of stimulation required for fused tetanus, and by the velocities of conduction of the nerve fibers innervating each of the muscle fiber types.

Partial transformation from fast to slow muscle fibers induced by deafferentation of capsaicin-sensitive muscle afferents

1997 ◽  
Vol 20 (11) ◽  
pp. 1404-1413 ◽  
Author(s):  
Orazio Brunetti ◽  
Anna M. Barazzoni ◽  
Giovannella Della Torre ◽  
Paolo Clavenzani ◽  
Vito E. Pettorossi ◽  
...  
Keyword(s):  
Muscle Fibers ◽  
Muscle Afferents ◽  
Slow Muscle ◽  
Partial Transformation

On the histochemical characterization and distribution of fast and slow muscle fibers in certain avian skeletal muscles

1987 ◽  
Vol 81 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Benjamin W.C. Rosser ◽  
M. Benjamin Davis ◽  
John R. Brocklebank ◽  
John C. George
Keyword(s):  
Skeletal Muscles ◽  
Muscle Fibers ◽  
Slow Muscle ◽  
Fast And Slow Muscle ◽  
Histochemical Characterization
Sign in / Sign up

Export Citation Format

Share Document