题目内容

（3）The wall of the heart between the right and the left atria is the _________.

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（4）The relaxation phase of the heartbeat is called _________.

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

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

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