题目内容

A gas released as a metabolic product of catabolism is ____.

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Specialized conductive tissue at the base of the wall between the two upper heart chambers is the ____.

The inner lining of the pericardium, adhering to the outside of the heart, is the ____.

An abnormal heart sound due to improper closure of heart valves is a ____.

The beat of the heart as felt through the walls of arteries is called the ____.