If a heart beats too slowly, the pacemaker will use electrical signals to help set a normal rate.

VOA: special.2010.06.02

One class of them is beta-blockers, they bind to beta-adrenergic receptors, which are receptors that exchange information between your nervous system and the contractile system that beats your heart and that causes the heartbeat.

一类药物是β阻断剂,它们与β肾上腺素受体结合,这种受体能够在神经系统和,控制心跳的心肌收缩系统之间传递信息,从而产生心跳

耶鲁公开课 - 生物医学工程探索课程节选

Some devices include a defibrillator, which gives a shock if the heart beats too fast.

VOA: special.2010.06.02

Some pacemakers include a defibrillator, which gives a shock if the heart beats too fast.

VOA: special.2010.06.29

We leave you with Miley Cyrus performing "My Heart Beats for Love,"

VOA: special.2010.08.06