Question

Which muscle is called pacemaker of the heart? Why?

Answer 1

Pacemakers. En español. Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's “natural pacemaker.”

Answer 2

The pacemaker is present near the opening of the superior vena cava and the atrioventricular node . A bundle of muscle fibres called 'Bundle of HIS' begins from AVN and extends to the interventricular septum. Bundle of HIS consists of branches of fibres called 'purkinije fibre'. All these together form a system which creates an impulse.

Sometimes the 'pacemaker' become faulty and for such situation a artificial pace-maker may be fixed.