What is the peacemaker of myocardium?

Answer: Atrioventricular node.

The atrioventricular node (AV node) is a small structure located in the heart that plays a crucial role in coordinating the electrical impulses between the atria and ventricles. It is often referred to as the "peacemaker of the myocardium" because it acts as a gatekeeper, ensuring that the electrical signals are transmitted in a controlled and synchronized manner.

Here are the main functions of the atrioventricular node:

1. Delay of Electrical Impulses: The AV node introduces a slight delay in the transmission of electrical impulses from the atria to the ventricles. This delay allows for a coordinated contraction of the heart chambers. It ensures that the atria have enough time to fill with blood before the ventricles contract, preventing backflow of blood.

2. Synchronization of Atrial and Ventricular Contractions: The AV node ensures that the electrical impulses are transmitted from the atria to the ventricles in a synchronized manner. This synchrony is essential for maintaining the proper pumping action of the heart.

3. Electrical Insulation: The AV node acts as an electrical insulator between the atria and ventricles. This insulation prevents the electrical impulses from traveling back from the ventricles to the atria, which could disrupt the normal heart rhythm.

Overall, the atrioventricular node is a vital component of the cardiac conduction system, responsible for maintaining a regular heart rate and ensuring efficient pumping of blood throughout the body.