As blood is pumped out of the heart and into the major arteries leaving the heart, it
A. pushes against the semilunar valves and opens them.
B. pushes against the semilunar valves and closes them.
C. fills the cusps of the semilunar valves, causing them to expand and block the backflow of blood
D. pushes against the atrioventricular valves and opens them.
E. fills the cusps of the atrioventricular valve causing opening of the bicuspid and closure of the tricuspid.
A
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