An increase in sympathetic stimulation of the heart would increase stroke volume by increasing

Ans. Contractility. It is defined as the intrinsic ability of the heart muscle to contract. An Anrep effect happens when there is an increase in contractility due to the activation of catecholamines. When this happens, it allows myocardium to compensate for an increase end-systolic volume and decreased stroke volume that occurs when aortic blood pressure increases. 

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