Innervation of the anterior byssal retractor muscle in Mytilus edulis L.

1975 ◽  
Vol 161 (4) ◽  
Author(s):  
Jacques Gilloteaux
Keyword(s):  
Mytilus Edulis ◽  
Retractor Muscle ◽  
Anterior Byssal Retractor Muscle

The effect of temperature on the tension responses of the anterior byssal retractor muscle (abrm) of Mytilus edulis

1982 ◽  
Vol 97 (1) ◽  
pp. 375-384
Author(s):  
C. M. Linehan
Keyword(s):  
Ambient Temperature ◽  
Latent Period ◽  
Mytilus Edulis ◽  
Effect Of Temperature ◽  
Retractor Muscle ◽  
Tension Development ◽  
Maximum Tension ◽  
Peak Tension ◽  
The Relationship ◽  
Anterior Byssal Retractor Muscle

The effect of ambient temperature on the response of the ABRM of Mytilus edulis to acetylcholine and 5-hydroxytryptamine has been examined. As the ambient temperature was increased, the latent period and the maximum tension developed decreased while the rate of tension development and the rate of relaxation increased. The relationship between temperature and the rate of tension development showed three distinct linear phases from 2–25, 25-35 and 35-45 degrees C. The reduction in peak tension with temperature could also be resolved into three portions from 2–25, 25-40 and above 40 degrees C. As the temperature was increased above approximately 27 degrees C the rate of relaxation in the absence of 5-HT approached the rate of relaxation in the presence of 5-HT. The significance of these results and possible explanations for them are considered.

Sperrtonus und Nucleosidtriphosphate

1963 ◽  
Vol 18 (2) ◽  
pp. 133-138 ◽  
Author(s):  
J. C. Rüegg ◽  
Erna Strassner
Keyword(s):  
Skeletal Muscle ◽  
Mytilus Edulis ◽  
Retractor Muscle ◽  
Atp Content ◽  
Wet Weight ◽  
Anterior Byssal Retractor Muscle ◽  
Vertebrate Skeletal Muscle

The resting anterior byssal retractor muscle of Mytilus edulis (ABRM) contains 1 -1.2 μmol ATP and 0.6 - 0.8 μmol ADP per g wet weight, traces of AMP and 0.1 - 0.2 μmol GTP plus UTP. The ATP content and the ratio of ADP : ATP remains almost constant during contraction, catch and subsequent serotonin induced relaxation, IMP could not be detected, not even during thaw contracture. Consequently the catch (viscous tone, fused state) is a reversible rigor distinct from rigor in vertebrate skeletal muscle which is caused by ATP deficiency. ATP produces a very much stronger contraction in isolated actomyosin systems of ABRM than UTP, ITP and GTP.

scholarly journals Characterization of the Cold-Induced Contracture of the Anterior Byssal Retractor Muscle of Mytilus Edulis

1985 ◽  
Vol 119 (1) ◽  
pp. 133-147
Author(s):  
CATHERINE M. LINEHAN
Keyword(s):  
Mytilus Edulis ◽  
Temperature Drop ◽  
Retractor Muscle ◽  
Initial Tension ◽  
High K ◽  
Anterior Byssal Retractor Muscle ◽  
Sudden Reduction

When the anterior byssal retractor muscle (ABRM) of Mytilus edulis was subjected to a sudden reduction in temperature during a contractionrelaxation cycle, a tension increment, the cold-induced contracture (CIC), was observed. The CIC could be obtained in a muscle stimulated by the application of acetylcholine (ACh), caffeine or high-K+ solutions, but could not be elicited from a muscle at rest or in ‘catch’. When the muscle was released from ‘catch’ by the application of 5-hydroxytryptamine (5-HT), a CIC could once again be produced. The CIC tension elicited after the application of ACh was shown to follow a log-dose relationship with respect to ACh concentration but no CIC was observed at an ACh concentration at which the initial tension was 10% or less of maximum. The CIC tension decreased with time after the application of ACh and appeared to be dependent on both the initial and final temperatures and on the size of the temperature drop. The significance of these results and possible explanations are considered.

The series elastic component and the force-velocity relation in the anterior byssal retractor muscle of Mytilus edulis during active and catch contractions

1976 ◽  
Vol 64 (2) ◽  
pp. 497-510
Author(s):  
T. Tameyasu ◽  
H. Sugi
Keyword(s):  
Mytilus Edulis ◽  
Isometric Tension ◽  
Elastic Component ◽  
Retractor Muscle ◽  
Series Elastic Component ◽  
Force Velocity ◽  
Length Changes ◽  
Anterior Byssal Retractor Muscle ◽  
Catch Mechanism ◽  
Series Elastic

1. The length changes of the anterior byssal retractor muscle (ABRM) of Mytilus edulis, following step changes in load, were studied at various phases of active and catch contractions produced by acetylcholine. 2. The load-extension curves of the series elastic component (SEC) were found to be scaled down in proportion to the isometric tension immediately before step changes in load, but remain unchanged irrespective of whether the ABRM was in active or in catch contraction. 3. In hypertonic solutions the compliance of the SEC was reduced in the same manner as that of the SEC in frog skeletal muscle. 4. These results seem to favour the linkage hypothesis for the catch mechanism, though the SEC in the ABRM is suggested to be composed not only of the cross-linkages, but also of the compliance of the myofilaments.

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