SCI-VIS IFC-CNR / SCIENCE PHOTO LIBRARY SCI-VIS IFC-CNR / SCIENCE PHOTO LIBRARY
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 green 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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