Steady state relation between cytoplasmic free Ca2+ concentration and force in intact frog skeletal muscle fibers.

Although the differences in Ca 50 were barely significant (0.01 < P < 0.05, paired t test), the relatively common descending limb of the loop observed with high concentrations of TBQ (1–5 μM) appears to reflect a near steady state relation between [Ca 2+ ] i and force.

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