Within the wall of the ____ atrium is patch of cells known as the ____ or pacemaker, as it controls the rate at which the heart beats. This is where the nervous stimulation for the heart to contract originates. The nervous impulse spreads across the ____ causing them to ____. A layer of non-conductive tissue prevents the wave of ____ crossing to the ventricles. Instead it is picked up by the ____ or AVN, which lies between the two atria. After a short delay, the nervous impulse passes down the bundle of ____ within the septum to the apex of the heart. ____ fibres within the walls of the ventricles transmit the impulse causing the ____ to contract from the bottom of the heart upwards forcing the blood out into the ____.

Cardiac cycle transmission of impulse - missing words

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