Which of the Following Criteria Must Be Met for the Heart

Which of the following criteria must be met for the heart to function efficiently?

A) Excitation and the consequent contraction of the cardiac muscle fibers of each heart chamber should be coordinated to assure efficient pumping
B) The atria should be excited and contract before the onset of ventricular contraction to assure that ventricular filling is complete
C) The right side of the heart should contract first to assure that oxygenated blood is delivered to the heart before the left side contracts
D) Both excitation and the consequent contraction of the cardiac muscle fibers of each heart chamber should be coordinated to assure efficient pumping and the atria should be excited and contract before the onset of ventricular contraction to assure that ventricular filling is complete are correct
E) All of the choices are correct