How would an increase in the sympathetic nervous system increase stroke volume?

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How would an increase in the sympathetic nervous system increase stroke volume?

The Correct Answer is

increased contractility.* by increasing available calcium), thus increasing stroke volume. Contractility causes an increase in stroke volume by decreasing end systolic volume; it does not change end diastolic volume.

Reason Explained

increased contractility.* by increasing available calcium), thus increasing stroke volume. Contractility causes an increase in stroke volume by decreasing end systolic volume; it does not change end diastolic volume. is correct for How would an increase in the sympathetic nervous system increase stroke volume?

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