New Delhi, June 8 -- The human heart beats nearly 100,000 times a day, powered by a precise electrical system that keeps blood flowing to every part of the body. Most of the time, this rhythm works silently in the background. But when it changes unexpectedly, it can signal that something needs attention. Understanding your heart rate is one of the simplest ways to monitor your heart health.

What is a natural heart rhythm?

The heart's rhythm is controlled by its own electrical network. At its core is the sinoatrial (SA) node, often called the heart's natural pacemaker. It generates electrical impulses that trigger each heartbeat and ensure the heart's chambers contract in a coordinated manner. It may temporarily rise during exercise or s...