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• Under ordinary situations, electric hobby is spontaneously generated by means of the SA node, the cardiac pacemaker. This electric impulse is propagated at some point of the proper atrium, and via Bachmann’s bundle to the left atrium, stimulating the myocardium of the atria to contract. The conduction of the electric impulses at some point of the atria is visible on the ECG because the P wave.

• As the electric activity is spreading for the duration of the atria, it travels thru specialized pathways, referred to as internodal tracts, from the SA node to the AV node.