★ Circulatory / Respiratory Quiz
Which structure prevents the backflow of blood from the ventricles to the atria?
A. AV valves
B. septum
C. sinoatrial node
D. atrioventricular node
E. superior vena cava
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The voice box is also known as the
A. pharynx
B. larynx
C. epiglottis
D. trachea
E. glottis
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