In Starling's law, increased venous return results in what?

In Starling's law, increased venous return leads to an increase in the end-diastolic volume, which stretches the myocardial fibers in the ventricle. As more blood fills the heart, the myocardial fibers are stretched, enhancing their contractile ability. This relationship is described by the Frank-Starling mechanism, which states that the greater the stretch of the cardiac muscle fibers (up to a point), the stronger the contraction will be. Therefore, with greater venous return, there is increased tension in the myocardial fibers, which results in an increased stroke volume. This principle is crucial for maintaining cardiac output in response to varying venous return volumes, as it helps the heart to efficiently adapt to changes in blood flow and demand.