★ Circulatory / Respiratory Quiz
Which structure initiates a heartbeat?
A. AV node
B. SA node
C. left ventricle
D. left atrium
E. right ventricle
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Which of the following bring blood into the right atrium
A. aorta
B. pulmonary artery
C. pulmonary veins
D. vena cava
E. brachiocephalic artery
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