★ Heart Quiz
The difference between the maximum and resting cardiac output is called __________.
A. preload
B. stroke volume
C. contractility
D. afterload
E. cardiac reserve
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Heart sound __________ is thought to result from the transition from expansion of the empty ventricles to their sudden filling with blood.
A. S1
B. S2
C. S3
D. S4
E. S0
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