As blood is pumped into the arterial trunks past the semilunar valves, it
A. pushes against the cusps, forcing the valves open.
B. fills the cusps, causing them to expand and open up for the flow of blood.
C. fills the cusps, causing them to expand and block the backflow of blood.
D. pushes against the cusps, forcing the valves closed.
E. None of these answers is correct.
Answer: A
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