[Tension response in skinned Ca-activated skeletal muscle fibers of the frog to temperature jump following stepwise changes in the fiber length].
Joulean temperature jump from 4-7 degrees to 20-25 degrees completed in 0.2 ms was applied to suspended in the air chemically skinned Ca-activated (pCa = 5.5-6) skeletal muscle fibres of the frog 2 ms after stepwise length changes (duration 0.3 ms, amplitudes --6. +3 nm per half sarcomere). The temperature jump induced a biphasic rise of tension, as was described earlier. Neither the time constant of the 2nd slow phase, nor maximum tension after the temperature jump were dependent on the length step amplitude. The amplitude and time constant of the 1st phase (1.2-0.28 ms) decreased after the fibre release. It shows that the 1st phase of the tension rise induced by the temperature jump is due to conformation in cross-bridges attached to thin filaments.
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Bershitskiĭ
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SIu
D000818:Animals; D001001:Anura; D002118:Calcium / Q000494:pharmacology*; D009132:Muscles / Q000033:anatomy & histology / Q000502:physiology*; D013696:Temperature; D013718:Tensile Strength
D002118:Calcium
Reaktsiia napriazheniia v demembranizirovannykh Ca-aktivirovannykh voloknak skeletnoĭ myshtsy liagushki na skachok temperatury posle stupenchatogo izmeneniia dliny.