11.  Which of the following best represents Starling's law? C
The heart needs to pump in order to sustain life.
Incorrect.
Atria always depolarize before the ventricles.
Incorrect.
Increased stretching of the cardiac muscle increases the stroke volume.  
Correct!
Cardiac output is related to both stroke volume and heart rate.
Incorrect.
Exercise almost always increases heart rate.
Incorrect.

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