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For relaxation to occur:A. Ach receptors close and Ca++ channels on the sarcoplasmic reticulum close. B. Ach receptors close and Ca++ channels on the sarcoplasmic reticulum open. C. Ach receptors open and Ca++ channels on the sarcoplasmic reticulum close. D. Ach receptors open and Ca++ channels on the sarcoplasmic reticulum open.
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