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21. Which structure prevents blood flowing back into the atria during ventricular contractions?(A) a
問題詳情
21. Which structure prevents blood flowing back into the atria during ventricular contractions?
(A) atrioventricular valves
(B) semilunar valves
(C)sinoatrial node
(D) carotid blood shunts
(E) foramen ovale
參考答案
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