题目内容

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

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（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 _______.

（10）An abnormal heart sound caused by improper closure of heart valves is a _____.