How the frank starling law of the heart helps to explain the influence of venous return on stroke volume?

The Frank-Starling law of the heart states that the force of cardiac contraction is proportional to the initial length of the cardiac muscle fibers, which is influenced by the volume of blood filling the heart (preload). As venous return increases, the heart fills with more blood, stretching the myocardial fibers and enhancing their contraction strength. This results in an increased stroke volume, illustrating how greater venous return directly boosts the amount of blood ejected with each heartbeat. Thus, the law highlights the intrinsic relationship between venous return and stroke volume regulation.