1 _hot_ - Heartbeat

A single, complete cycle of contraction and relaxation.

A single heartbeat, often referred to as a cardiac cycle, is a sophisticated two-part pumping action that occurs in approximately one second. This process is governed by the heart's internal electrical system, led by the , commonly known as the natural pacemaker . The cycle consists of two primary phases: heartbeat 1

While often used interchangeably, there is a distinct difference between a heartbeat and heart rate: A single, complete cycle of contraction and relaxation