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 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

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