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“Elevation of Ca concentration and/or addition of orciprenaline augment the amplitudes of contractions elicited by rhythmical stimulation, but … of test contractions elicited after a test interval of 1–2 s. It is suggested that calcium and orciprenaline … calcium loss from the sarcoplasmic reticulum out … during a prolonged interval.”
“ Orciprenaline inhibited the contraction produced by Ca , K, acetylcholine and Ba in a dose-dependent manner, and the inhibition became larger in the order of Ca, K, acetylcholine and Ba.”