the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse in conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles.
英
美
- 一搏動(dòng)的開(kāi)始至下一心博的開(kāi)始，心臟活動(dòng)的全過(guò)程。
