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SCI-VIS IFC-CNR / SCIENCE PHOTO LIBRARY SCI-VIS IFC-CNR / SCIENCE PHOTO LIBRARY
3D animation of a sarcomere (repeating contractile unit of myofibrils) in a cardiac muscle cell during a healthy cardiac cycle. At systole, the sarcomere shortens (cardiac muscle cell contracts) and it lengthens (cardiac muscle cell relaxes) at diastole. The speed and intensity of motion increases when the heart rate increases. The blue line (top right corner) is representative of an electrocardiogram (ECG) trace, illustrating the electrical activity of the heart during the cardiac cycle.
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