What Receive electrical signals to contract ventricals?

The electrical signals that trigger the contraction of the ventricles originate from the sinoatrial (SA) node, which is the heart's natural pacemaker. These signals travel through the atrioventricular (AV) node and then along the bundle of His, branching into the Purkinje fibers that spread throughout the ventricles. This coordinated electrical activity ensures that the ventricles contract effectively to pump blood out of the heart.