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# During cardiac cycle :

( A ) The SA Node generates an action potential which stimulates both the atria to undergo contraction; first right and then left together called the atrial systole.
( B ) The atria undergoes relaxation (diastole), coinciding with the ventricular systole.
( C ) The action potential is conducted to the ventricular side by the AV bundle usually bypassing AV Node
( D ) Atrial systole increases the flow of blood into the ventricles by about 50 per cent.

The SAN now generates an action potential which stimulates both the atria to undergo a simultaneous contraction the atrial systole. This increases the flow of blood into the ventricles by about 30 per cent. The action potential is conducted to the ventricular side by the AVN and AV bundle from where the bundle of His transmits it through the entire ventricular musculature. This causes the ventricular muscles to contract, (ventricular systole), the atria undergoes relaxation (diastole), coinciding with the ventricular systole.