Why we control our heart beat like limb movement?

The heart is not under conscious control like limb movements. The heart's rhythm is regulated by the sinoatrial node (SA node), which is a cluster of specialized cells located in the right atrium. The SA node generates electrical impulses that cause the heart muscle to contract. These impulses are then conducted through the heart's conduction system, which includes the atrioventricular node (AV node), the bundle of His, and the Purkinje fibers. This system ensures that the heart contracts in a coordinated manner.

While we cannot directly control our heart rate, there are certain factors that can influence it. For example, exercise, stress, and caffeine can all cause the heart rate to increase. Conversely, relaxation, sleep, and certain medications can slow the heart rate.