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 heart is involved in controlling thgl:de68g/cyhd o-vv6 e frequency at which it j/mw:ooz71acl:gi jli;bo/*2an.ta beats?ojob l*mgtzo wia1/:/ln .i 2c:aa; 7j

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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