What are the two phases of the cardiac cycle?
A) Diastole, in which the ventricles contract, and systole, in which the ventricles relax
B) Systole, in which the ventricles contract, and diastole, in which the ventricles relax
C) Systole, in which the atria contract, and diastole, in which the ventricles contract
D) Diastole, in which the atria relax, and systole, in which the ventricles relax
E) Systole, in which the atria relax, and diastole, in which the atria contract
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