The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A scientist observes a myocyte beating in cell culture. Which step is the most direct necessary component of relaxation for this cell?   (A) Influx of sodium ions   (B) Influx of calcium ions from the sacroplasmic reticulum   (C) Influx of calcium ions from outside the myocyte   (D) Efflux of calcium ions
['(D) Efflux of calcium ions <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Influx of sodium ions \n (B) Influx of calcium ions from the sacroplasmic reticulum \n (C) Influx of calcium ions from outside the myocyte \n (D) Efflux of calcium ions <> possible answers', '  A scientist observes a myocyte beating in cell culture. Which step is the most direct necessary component of relaxation for this cell? <> context@']