AV Node and Bundle: Heart Conduction — NEET Biology

Which of the following statements regarding the intrinsic cardiac regulation and conduction system are NOT correct? S1: The nodal musculature, including the SA node, is capable of generating action potentials without any external stimuli. S2: The SA node, located in the lower left corner of the right atrium, is responsible for initiating and maintaining the rhythmic contractile activity of the heart. S3: The AV bundle continues from the AVN, passes through the atrio-ventricular septa, and immediately divides into right and left bundles. S4: The Purkinje fibres are minute fibres arising from the AV bundle branches that distribute throughout the atrial musculature. S5: The SA node generates the maximum number of action potentials per minute (70-75 min–1), which is why it is referred to as the 'pacemaker' of the heart. S6: In a healthy individual, the heart normally beats approximately 100 times per minute, largely due to the SAN's action potential generation.