This article explores the heart phylogeny, the development of the heart from embryonic to adult shape. For the shape change from tubular to four-chamber to be initiated, a mechanical twist needs to be present in the embryonic heart tube. The helical shape of the muscle fibers in the embryonic heart is a necessary but not a sufficient condition for the transformation to occur. It is also necessary for the excitation pattern to be in the form of a spatiotemporal wave. Such a combination, while producing twist, does not negatively impact the heart's ability to work as a pump.
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