The reason why the heart beats is the process of contraction and diastole of the atrial and ventricular muscles governed by the electrical activity generated by the special conduction tissue of the heart. In addition to the characteristics of general cells, cardiac myocytes have their own important physiological characteristics and special bioelectrical activities, which are characterized by excitability, conductivity, autoregulation and contractility. Autoregulation means that they can still generate action potentials regularly and automatically without external stimuli, i.e. the special conduction system of the heart. The special conduction system of the heart includes the sinus node, the inter-nodal bundle, the right and left bundle branches, and the Purkinje fibers. The sinus node P-cells of the right atrium can spontaneously and rhythmically discharge and sequentially transmit to the lower conduction cells, first causing excitation of the atrial muscle, atrial contraction, and ventricular diastole; then the electrical activity is transmitted to the ventricular muscle, ventricular muscle excitation, ventricular contraction, and atrial diastole. The electrical activity is then transmitted to the ventricular muscle, which excites the ventricular muscle, contracting the ventricles and diastolizing the atria. If there is any discomfort such as abnormal heartbeat, please consult the hospital in time to avoid adverse consequences.