CBSE Class 10 Answered

Human heart is capable of generating a cardiac contraction (heart beat) independent of the nervous system. It has intrinsic contractile property which is independent of impulses from the nervous system. Hence human heart is myogenic.

(Each individual heartbeat is actually a collection of several muscle movements spurred into action by electrical impulses.

The first electrical signal comes from the heart’s own natural pacemaker, the sinoatrial node, comprised of electrically active cells and located in the upper right heart chamber. This node sends a steady stream of electrical signals along a pathway through the heart’s upper chambers. The signals then travel to the AV node, a small area in the heart that serves as an electrical relay station between the atria and the ventricles. From the AV node, these electrical signals travel along special conduction tissues to reach the walls of the ventricles, causing the ventricles to pump.)