Valinomycin and excitation-contraction coupling in skeletal muscle fibres of the frog

1. Experiments were carried out on intact frog skeletal muscle fibres to study the role of H+ and K+ as counter-ions during the release of Ca2+ from the sarcoplasmic reticulum (SR). A specific focus was to test whether valinomycin, a potassium ionophore, markedly reduces or abolishes H+ counter-ions...

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