I need help with question 3 Intercalated discs serve to transfer from cell to cell. A ionic currents B. action potentials C. electrical signals D. All of the answers are correct. QUESTION 2 What feature of the electrocardiogram masks repolarization of the atrial wall? A QRS complex B. S-T interval C. T wave D. P wave QUESTION 3 Coronary veins empty into the A left atrium. B. right atrium. C. right ventricle. D. left ventricle..