本题目来源于试卷: Form and Function B.7 Transport，类别为 IB生物学
[问答题]
The diagram below shows the structr 7a;nf a9rv, dt+7xature of akfc sj9 9.mid2 heart.
1.With the use of labels, identify the following in the diagram above.
right atrium
left ventricle
atrioventricular valves
semilunar valves
2.1.Identify the location of the sinoatrial node.
2.2.Describe the function of the sinoatrial node.
2..Describe how the heart responds to messages from the brain.
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