As part of an investigation of the histology and functional anatomy of the crocodilian heart, electrocardiograms ... of the several events within the cardiac cycle.

Cardiac MRI "provides the gold standard of cardiac function and anatomy unsurpassed image quality in evaluating heart structure and function in 3-D-quality moving images," Levine tells WebMD.

If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump ...