题目内容

（5）Specialized conductive tissue in the wall between the ventricles is the ______.

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（6）The inner lining of the heart is the _______.

（7）The contractive phase of the heartbeat is called _______.

（8）A gas released as a metabolic product of catabolism is ______.

（9）Specialized conductive tissue at the base of the wall between the two upper heart chambers is the _______.