cardiac cycle

例句：

1. 1. The heart's cardiac cycle is essential for maintaining the body's proper functioning.
   心脏的循环周期对于保持身体正常功能至关重要。
2. 2. During the cardiac cycle, the heart pumps blood throughout the body.
   在心脏循环周期中，心脏将血液泵送到全身。
3. 3.Cardiac cycles are crucial in the regulation of blood pressure and heart rate.
   心脏循环周期在调节血压和心率方面起着关键作用。