“The law of the heart is thus the same as the law of muscular tissue generally, that the energy of contraction, however measured, is a function of the length of the muscle fibre.” HeartLawScienceEnergyFunctionMusclesLengthTissuesContractions Book:Starling on the Heart: Facsimile Reprints, Including the Linacre Lecture on the Law of the Heart Source: Starling on the Heart: Facsimile Reprints, Including the Linacre Lecture on the Law of the Heart