Stroke volume
A. Is the difference between end-diastolic volume (EDV) and end-systolic volume (ESV)
B. Is higher in athletes compared to non-athletes at rest, leading to decreased resting heart rate
C. Can be increased by contracting skeletal muscle
D. Is normally 50-75% of the end-diastolic volume
E. All of the above are true of stroke volume
Answer: E. All of the above are true of stroke volume
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