Form and Function B.7 Transport (id: e1408471f)

本题目来源于试卷: Form and Function B.7 Transport，类别为 IB生物学

[单选题]
Which region of the hear2yod/e t106g .sexolut is involved in n8o2yxyhx xfzify /wwg*,3/7controlling the frequency at which it beats owh nf/z/7yigx3f x8, yxw2*y?

A. Sinoatrial node
B. The opening of the atrioventricular valves
C. Pulmonary circulation
D. The opening of the semilunar valves


参考答案:  A


本题详细解析:

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