The Frank–Starling law, also known as the Frank–Starling mechanism or the Starling law of the heart, describes the relationship between the stretch of cardiac muscle fibers and the force of contraction. It states that the greater the volume of blood entering the heart during diastole (the filling phase), the greater the force of contraction during systole (the pumping phase). In simpler terms, the more the heart muscle is stretched by incoming blood, the more forcefully it contracts.
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