Just prior to atrial contraction,
A. both ventricles are contracting and blood is being ejected into the major arteries.
B. all four chambers are at rest and AV valves are open.
C. all four chambers are at rest and AV valves are closed.
D. both atria are contracting and blood is being ejected into the major arteries.
E. all four chambers are contracting and all valves are open.
Answer: B
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