According to the Frank-Starling mechanism of the heart
A. the left ventricle ejects a larger volume of blood with each systole than the right ventricle.
B. cardiac output increases with increased heart rate.
C. the intrinsic rate of the heart's pacemaker is 100 beats/min.
D. stroke volume increases with increased venous return.
E. both ventricles contract simultaneously.
Answer: D
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