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 h.lfk6q rm- wmqj:vn 6)ev4g1vtlwwc8g d*8 i7xq e cco0wo0/2bart is involved in controlling the frequency at which it beats?i/wqb2v8gvl * x1 ccgo0etw7w 0c84od

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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