How does the Frank-Starling curve affect stroke volume during exercise?
A. The increased sympathetic stimulation causes the heart to be faster with smaller stroke volumes
B. The Frank-Starling curve is only activated when the heart rate reaches 90% of the maximum targeted rate
C. The increased venous return causes cardiac chambers to increase in size and thus contract with more force
D. The Frank-Starling law only affects heart rate, not stroke volume
Answer: C
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