How Does the Frank-Starling Curve Affect Stroke Volume During Exercise

How does the Frank-Starling curve affect stroke volume during exercise?

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

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