The atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. The electrical system (including SA, AV nodes and Purkinje fibres) is the power source that makes this possible.
The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node (pacemaker of the heart). The electrical activity spreads through the walls of the atria and causes them to contract.
AV node (atrioventricular node) present in the center of the heart between the atria and ventricles, acts like a gate that slows the electrical signal before it enters the ventricles. This delay gives the atria time to contract before the ventricles do, and empty all the bllod into ventricles.
Purkinje fibers sends the impulse to the muscular walls of the ventricles and causes them to contract. they start contraction of heart from the apex so that the ventricles contract from below to upwards pushing the blood out of ventricles.
Hope it helps you very much
The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node (pacemaker of the heart). The electrical activity spreads through the walls of the atria and causes them to contract.
AV node (atrioventricular node) present in the center of the heart between the atria and ventricles, acts like a gate that slows the electrical signal before it enters the ventricles. This delay gives the atria time to contract before the ventricles do, and empty all the bllod into ventricles.
Purkinje fibers sends the impulse to the muscular walls of the ventricles and causes them to contract. they start contraction of heart from the apex so that the ventricles contract from below to upwards pushing the blood out of ventricles.
Hope it helps you very much
