Operation of the Starling law ensures that when the amount of blood returned to the heart is increased,stroke volume automatically increases to pump it out.

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The Starling law, also known as the Frank-Starling law, states that the more the myocardial fibers are stretched during diastole, the stronger the next systolic contraction will be. This ensures that when the amount of blood returned to the heart is increased, the myocardial fibers are stretched more and stroke volume automatically increases to pump the increased amount of blood out, which helps to maintain cardiac output.

Operation of the Starling Law Ensures That When the Amount