Which statement explains why the ventricles contract after the atria?
1 )
The band of fibres between the atria and the ventricles conducts the excitation wave slowly.
The excitation wave has to pass through a small area of conducting fibres in the septum.
3 )
The excitation wave has to travel further to reach the base of the ventricles than to spread across the atria.
4 )
The excitation wave travels slowly through the Purkyne tissue to reach the base of the septum.
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