Cardiac / heart muscle is ____. The heartbeat starts at the ____ / SAN/pacemaker// SA node generates impulse. The impulse from the pacemaker spread across ____. Both atria ____ / atrial systole. The impulse reaches the ____ / AVN / AV node. The impulse is ____ for 0.1 seconds after reaching AVN. The impulse travels through the ____, bundle branches then to ____ before spreading to all parts of both ventricles. Both ventricles ____ / ventricular systole. Events known as the ____. ____ sound is produced as the atrioventricular valve / AV // tricuspid and ____ closed. ____ sound produced as ____ / SV closed.

Describe the mechanism of heart beat in mammals.

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