In the heart, as in the movies, 3D action beats the 2D experience hands down. In 3D, healthy hearts do their own version of the twist. Rather than a simple pumping action, they circulate blood as if they were wringing a towel. The bottom of the heart twists as it contracts in a counterclockwise direction while the top twists clockwise. Scientists call this the left ventricular twist-and it can be used as an indicator of heart health.
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