| Research Abstract |
The relationship between carp muscle tension in rigor and the tension induced by permeation of calcium ions from immersion solution were investigated. In both unstressed and stressed fish muscles, the first peak tension was generated by the permeation of calcium ions through the site of endomysium in muscle surface which was damaged at the time of the trimming of excised muscle. Since endomysium structure in muscle inside was not weakened in unstressed fish muscle, calcium ions in immersion solution could not permeate into muscle inside. Therefore, the tension generations due to the rigor and the external calcium ions could be distinguished as two independent phenomena. Since endomysium structure in muscle inside was weakened in stressed fish muscle, calcium ions could permeate into muscle inside. As a result, the tension generations due to the rigor and the external calcium ions were detected as a superimposed phenomenon. When the osmotic pressure was increased, the muscle surface contracted stronger with more external calcium ions generating greater first peak tension and the external calcium ions became not to permeate into muscle inside. The tension generations due to the rigor and the external calcium ions became to be distinguished again.
"Arai" is a phenomenon that the calcium ions in the immersion solution permeate intomuscle surface which was damaged at the tine of muscle strip excision, and their interaction with the remaining ATP induces the tetanic contraction of muscle. The water in the immersionsolution not only promotes the permeation of calcium ions, but also generates the muscletension by its own permeation. This investigation enabled to distinguish the effects of calcium ions and waler quantitatively, and the extents of these effects were discussed.
|
